chore: fix annoying issue with multiple canvas demo casing

playground/src/router.ts

@@ -34,7 +34,7 @@ const routes = [
   {
     path: '/multiple',
     name: 'Multiple',
-    component: () => import('./pages/Multiple.vue'),
+    component: () => import('./pages/MultipleCanvas.vue'),
   },
   {
     path: '/cameras/multiple-cameras',