diff --git a/src/vs/workbench/browser/parts/editor/editorCommands.ts b/src/vs/workbench/browser/parts/editor/editorCommands.ts
index 3362b223c5622..8b966c40e89ff 100644
--- a/src/vs/workbench/browser/parts/editor/editorCommands.ts
+++ b/src/vs/workbench/browser/parts/editor/editorCommands.ts
@@ -632,12 +632,13 @@ export function splitEditor(editorGroupService: IEditorGroupsService, direction:
 		editorToCopy = withNullAsUndefined(sourceGroup.activeEditor);
 	}
 
+	// Copy the editor to the new group, else move the editor to the new group
 	if (editorToCopy && (editorToCopy as EditorInput).supportsSplitEditor()) {
 		sourceGroup.copyEditor(editorToCopy, newGroup);
+		// Focus
+		newGroup.focus();
 	}
 
-	// Focus
-	newGroup.focus();
 }
 
 function registerSplitEditorCommands() {
diff --git a/src/vs/workbench/contrib/customEditor/browser/customEditorInput.ts b/src/vs/workbench/contrib/customEditor/browser/customEditorInput.ts
index 32ebe180bdd49..9255be1615776 100644
--- a/src/vs/workbench/contrib/customEditor/browser/customEditorInput.ts
+++ b/src/vs/workbench/contrib/customEditor/browser/customEditorInput.ts
@@ -90,7 +90,7 @@ export class CustomEditorInput extends LazilyResolvedWebviewEditorInput {
 	}
 
 	public supportsSplitEditor() {
-		return true;
+		return !!this.customEditorService.getCustomEditorCapabilities(this.viewType)?.supportsMultipleEditorsPerDocument;
 	}
 
 	getName(): string {
diff --git a/src/vs/workbench/contrib/customEditor/browser/customEditors.ts b/src/vs/workbench/contrib/customEditor/browser/customEditors.ts
index 03388999dfcde..323de4b2f5ce3 100644
--- a/src/vs/workbench/contrib/customEditor/browser/customEditors.ts
+++ b/src/vs/workbench/contrib/customEditor/browser/customEditors.ts
@@ -199,7 +199,7 @@ export class CustomEditorService extends Disposable implements ICustomEditorServ
 		});
 	}
 
-	private getCustomEditorCapabilities(viewType: string): CustomEditorCapabilities | undefined {
+	public getCustomEditorCapabilities(viewType: string): CustomEditorCapabilities | undefined {
 		return this._editorCapabilities.get(viewType);
 	}
 
diff --git a/src/vs/workbench/contrib/customEditor/common/customEditor.ts b/src/vs/workbench/contrib/customEditor/common/customEditor.ts
index 06fd5954c37d7..1e9ec786ee1f0 100644
--- a/src/vs/workbench/contrib/customEditor/common/customEditor.ts
+++ b/src/vs/workbench/contrib/customEditor/common/customEditor.ts
@@ -44,6 +44,7 @@ export interface ICustomEditorService {
 	openWith(resource: URI, customEditorViewType: string, options?: ITextEditorOptions, group?: IEditorGroup): Promise<IEditorPane | undefined>;
 
 	registerCustomEditorCapabilities(viewType: string, options: CustomEditorCapabilities): IDisposable;
+	getCustomEditorCapabilities(viewType: string): CustomEditorCapabilities | undefined
 }
 
 export interface ICustomEditorModelManager {