Add a meh placeholder to the select

module/Apps/StatsViewer.mjs

@@ -43,6 +43,13 @@ export class StatsViewer extends HandlebarsApplicationMixin(ApplicationV2) {
 	async _onRender(context, options) {
 		await super._onRender(context, options);
 
+		/*
+		Removes the Foundry empty placeholder and allows my custom placeholder.
+		See: https://github.com/foundryvtt/foundryvtt/issues/12572
+		*/
+		this.element.querySelector(`multi-select option:first-child:empty`)
+			?.remove();
+
 		const elements = this.element
 			.querySelectorAll(`[data-bind]`);
 		for (const input of elements) {

public/templates/Apps/StatsViewer/dataFilters.hbs

@@ -6,6 +6,7 @@
 	<multi-select
 		data-bind="_selectedUsers"
 	>
+		<option value="">Add a User</option>
 		{{ st-options selectedUsers users }}
 	</multi-select>
 </div>