function startKeyUserAdaptation(mPropertyBag) {
		var mOptions = {
			rootControl: mPropertyBag.rootControl,
			flexSettings: {
				developerMode: false,
				layer: Layer.CUSTOMER
			}
		};
		return adaptationStarter(mOptions);
	}
Starts key user adaptation, initiated for an application at the passed root control instance.
It subsequently extends to all valid child controls.

@function
@since 1.71
@alias module:sap/ui/rta/api/startKeyUserAdaptation

@param {object} mPropertyBag - Object with properties
@param {sap.ui.core.Control|sap.ui.core.UIComponent} mPropertyBag.rootControl - Control instance to get the AppComponent. This then is used to start UI adaptation.

@returns {Promise} Resolves when UI adaptation was successfully started
@public