Make simple file dialog setting a real setting

Fixes #73783

src/vs/workbench/browser/workbench.contribution.ts

@@ -239,6 +239,11 @@ import { isMacintosh } from 'vs/base/common/platform';
 				'description': nls.localize('workbench.useExperimentalGridLayout', "Enables the grid layout for the workbench. This setting may enable additional layout options for workbench components."),
 				'default': false,
 				'scope': ConfigurationScope.APPLICATION
+			},
+			'workbench.simpleFileDialog.enable': {
+				'type': 'boolean',
+				'description': nls.localize('workbench.simpleFileDialog.enable', "Enables the simple file dialog. The simple file dialog replaces the system file dialog when enabled."),
+				'default': false,
 			}
 		}
 	});

src/vs/workbench/services/dialogs/browser/fileDialogService.ts

@@ -85,8 +85,8 @@ export class FileDialogService implements IFileDialogService {
 	}
 
 	private shouldUseSimplified(schema: string): boolean {
-		const setting = this.configurationService.getValue('workbench.dialogs.useSimplified');
-		return (schema !== Schemas.file) || ((setting === 'true') || (setting === true));
+		const setting = this.configurationService.getValue('workbench.simpleFileDialog.enable');
+		return (schema !== Schemas.file) || (setting === true);
 	}
 
 	private ensureFileSchema(schema: string): string[] {