try something

Author: adolgachev

src/material/slide-toggle/slide-toggle.html

@@ -53,13 +53,11 @@
     </span>
   </button>
 
-  @if (!hideLabel) {
     <!--
       Clicking on the label will trigger another click event from the button.
       Stop propagation here so other listeners further up in the DOM don't execute twice.
     -->
     <label class="mdc-label" [for]="buttonId" [attr.id]="_labelId" (click)="$event.stopPropagation()">
       <ng-content></ng-content>
     </label>
-  }
 </div>

src/material/slide-toggle/slide-toggle.scss

@@ -33,6 +33,10 @@ $fallbacks: m3-slide-toggle.get-tokens();
   }
 }
 
+label:empty {
+  display: none;
+}
+
 .mdc-switch__track {
   overflow: hidden;
   position: relative;