diff --git a/rust/perspective-viewer/src/rust/components/column_settings_sidebar/sidebar.rs b/rust/perspective-viewer/src/rust/components/column_settings_sidebar/sidebar.rs
index 2075dca88a..1dc75d0ee1 100644
--- a/rust/perspective-viewer/src/rust/components/column_settings_sidebar/sidebar.rs
+++ b/rust/perspective-viewer/src/rust/components/column_settings_sidebar/sidebar.rs
@@ -120,7 +120,7 @@ impl ColumnSettingsSidebar {
         self.save_enabled = changed && valid;
     }
 
-    fn initialize(ctx: &yew::prelude::Context<Self>) -> Self {
+    fn initialize(&mut self, ctx: &yew::prelude::Context<Self>) {
         let column_name = ctx
             .props()
             .selected_column
@@ -134,11 +134,7 @@ impl ColumnSettingsSidebar {
         let initial_expr_value = Rc::new(initial_expr_value);
         let initial_header_value =
             (*initial_expr_value != column_name).then_some(column_name.clone());
-        let maybe_ty = ctx
-            .props()
-            .session
-            .metadata()
-            .get_column_view_type(&column_name);
+        let maybe_ty = ctx.props().selected_column.view_type(ctx.props().session());
 
         // NOTE: This is going to be refactored soon.
         let tabs = {
@@ -177,7 +173,7 @@ impl ColumnSettingsSidebar {
             tabs
         };
 
-        Self {
+        *self = Self {
             column_name,
             expr_value: initial_expr_value.clone(),
             initial_expr_value,
@@ -186,7 +182,8 @@ impl ColumnSettingsSidebar {
             maybe_ty,
             tabs,
             header_valid: true,
-            ..Default::default()
+            session_sub: self.session_sub.take(),
+            ..*self
         }
     }
 }
@@ -196,7 +193,6 @@ impl Component for ColumnSettingsSidebar {
     type Properties = ColumnSettingsProps;
 
     fn create(ctx: &yew::prelude::Context<Self>) -> Self {
-        let mut this = Self::initialize(ctx);
         let session_cb = ctx
             .link()
             .callback(|_| ColumnSettingsMsg::SessionUpdated(()));
@@ -205,14 +201,19 @@ impl Component for ColumnSettingsSidebar {
             .renderer
             .session_changed
             .add_listener(session_cb);
-        this.session_sub = Some(session_sub);
+
+        let mut this = Self {
+            session_sub: Some(session_sub),
+            ..Default::default()
+        };
+        this.initialize(ctx);
         this
     }
 
     fn changed(&mut self, ctx: &yew::prelude::Context<Self>, old_props: &Self::Properties) -> bool {
         if ctx.props() != old_props {
             let selected_tab = self.selected_tab;
-            *self = Self::initialize(ctx);
+            self.initialize(ctx);
             self.selected_tab = selected_tab;
             self.selected_tab_idx = self
                 .tabs
@@ -300,7 +301,7 @@ impl Component for ColumnSettingsSidebar {
                 true
             },
             ColumnSettingsMsg::SessionUpdated(()) => {
-                *self = Self::initialize(ctx);
+                self.initialize(ctx);
                 true
             },
         }
diff --git a/rust/perspective-viewer/src/rust/components/viewer.rs b/rust/perspective-viewer/src/rust/components/viewer.rs
index add913b777..18f2c75242 100644
--- a/rust/perspective-viewer/src/rust/components/viewer.rs
+++ b/rust/perspective-viewer/src/rust/components/viewer.rs
@@ -92,6 +92,11 @@ impl ColumnLocator {
     pub fn is_expr(&self) -> bool {
         matches!(self, ColumnLocator::Expr(_))
     }
+
+    pub fn view_type(&self, session: &Session) -> Option<Type> {
+        let name = self.name().cloned().unwrap_or_default();
+        session.metadata().get_column_view_type(name.as_str())
+    }
 }
 
 #[derive(Properties)]
diff --git a/rust/perspective-viewer/test/js/column_settings/interactions.spec.ts b/rust/perspective-viewer/test/js/column_settings/interactions.spec.ts
index 9a839324f1..42839ccf65 100644
--- a/rust/perspective-viewer/test/js/column_settings/interactions.spec.ts
+++ b/rust/perspective-viewer/test/js/column_settings/interactions.spec.ts
@@ -33,6 +33,7 @@ type Action =
     | "deactivate"
     | "reorder"
     | "aggregate"
+    | "deaggregate"
     | "groupby"
     | "splitby"
     | "orderby"
@@ -149,6 +150,23 @@ const TEST_SPEC: Record<string, TestSpec> = {
             },
         },
     },
+    Deaggregate: {
+        initial_state: {
+            open: true,
+            active: true,
+        },
+        actions: ["deaggregate"],
+        outputs: {
+            table_col: {
+                unchanged: true,
+                type: "string",
+            },
+            expr_col: {
+                unchanged: true,
+                type: "string",
+            },
+        },
+    },
     "Groupby - Active": {
         initial_state: {
             open: true,
@@ -263,7 +281,11 @@ async function checkOutput(
 ) {
     const POSSIBLE_TABS = ["Style", "Attributes"];
 
-    const check_tabs = async (selectedTab, tabs, unexpected_tabs) => {
+    const check_tabs = async (
+        selectedTab: string,
+        tabs: string[],
+        unexpected_tabs: string[]
+    ) => {
         await view.columnSettingsSidebar.container
             .locator(".tab.selected")
             .getByText(selectedTab)
@@ -333,7 +355,7 @@ test.describe("Column Settings State on Interaction", () => {
             "orderby",
             "where",
         ],
-        text: ["reorder", "open", "deactivate"],
+        text: ["reorder", "open", "deactivate", "deaggregate"],
         dnd: ["open", "deactivate", "groupby", "splitby"],
     };
 
@@ -366,6 +388,14 @@ test.describe("Column Settings State on Interaction", () => {
                                 await selector.activeBtn.click();
                                 break;
                             }
+                            case "deaggregate": {
+                                await pageView.settingsPanel.groupby("Row ID");
+                                await pageView.settingsPanel.removeViewParameter(
+                                    "groupby",
+                                    "Row ID"
+                                );
+                                break;
+                            }
                             default: {
                                 test.fail(true, "Unreachable");
                             }
@@ -488,6 +518,21 @@ test.describe("Column Settings State on Interaction", () => {
                                 );
                                 break;
                             }
+                            case "deaggregate": {
+                                let aggregator =
+                                    pageView.settingsPanel.inactiveColumns.columnSelector.first();
+                                await aggregator.dragTo(
+                                    pageView.settingsPanel.groupbyInput
+                                );
+                                aggregator = page
+                                    .locator("#group_by .pivot-column")
+                                    .first();
+                                await aggregator.dragTo(
+                                    pageView.settingsPanel.activeColumns.container
+                                        .locator(".column-selector-column")
+                                        .first()
+                                );
+                            }
                         }
                         await checkOutput(
                             pageView,
diff --git a/tools/perspective-test/results.tar.gz b/tools/perspective-test/results.tar.gz
index 49f8aa831c..6a7ae4f877 100644
Binary files a/tools/perspective-test/results.tar.gz and b/tools/perspective-test/results.tar.gz differ
diff --git a/tools/perspective-test/src/js/models/settings_panel.ts b/tools/perspective-test/src/js/models/settings_panel.ts
index 3259abc79e..b1a7feaea2 100644
--- a/tools/perspective-test/src/js/models/settings_panel.ts
+++ b/tools/perspective-test/src/js/models/settings_panel.ts
@@ -178,6 +178,32 @@ export class SettingsPanel {
             .waitFor();
         await locator.press("Enter");
     }
+
+    async removeViewParameter(type: ViewParameter, name: string) {
+        let locator: Locator;
+        switch (type) {
+            case "groupby":
+                locator = this.container.locator("#group_by .pivot-column");
+                break;
+            case "orderby":
+                locator = this.container.locator("#sort .pivot-column");
+                break;
+            case "splitby":
+                locator = this.container.locator("#split_by .pivot-column");
+                break;
+            case "where":
+                locator = this.container.locator("#filter .pivot-column");
+                break;
+            default:
+                throw "Invalid type passed!";
+        }
+        await locator
+            .filter({ hasText: name })
+            .first()
+            .locator(".row_close")
+            .click();
+    }
+
     /**
      * Selects a plugin by it's display name, i.e. the innerText of the .plugin-select-item
      * @param name