Hide NavList sub items if collapsed (#5567)

* add display prop

* Create swift-baboons-compare.md

Author: langermank

.changeset/swift-baboons-compare.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+Hide NavList sub items if collapsed

packages/react/src/ActionList/ActionList.module.css

@@ -466,6 +466,10 @@
       transform: scaleY(1);
     }
 
+    & + .SubGroup {
+      display: none;
+    }
+
     /* show active indicator on parent collapse if child is active */
     &:has(+ .SubGroup [data-active='true']) {
       background: var(--control-transparent-bgColor-selected);