diff --git a/client/scss/overrides/_utilities.legacy.scss b/client/scss/overrides/_utilities.legacy.scss
index 26c4dcea4b..dcf3980ed6 100644
--- a/client/scss/overrides/_utilities.legacy.scss
+++ b/client/scss/overrides/_utilities.legacy.scss
@@ -1,8 +1,3 @@
-.u-hidden {
-  // stylelint-disable-next-line declaration-no-important
-  display: none !important;
-}
-
 .nice-padding {
   padding-inline-start: $mobile-nice-padding;
   padding-inline-end: $mobile-nice-padding;
diff --git a/client/src/entrypoints/admin/comments.js b/client/src/entrypoints/admin/comments.js
index 9b96aa01c9..817f605469 100644
--- a/client/src/entrypoints/admin/comments.js
+++ b/client/src/entrypoints/admin/comments.js
@@ -105,11 +105,11 @@ window.comments = (() => {
     }
 
     show() {
-      this.node.classList.remove('u-hidden');
+      this.node.classList.remove('!w-hidden');
     }
 
     hide() {
-      this.node.classList.add('u-hidden');
+      this.node.classList.add('!w-hidden');
     }
 
     setOnClickHandler(localId) {
@@ -231,7 +231,7 @@ window.comments = (() => {
         'aria-describedby',
         this.commentAdditionNode.getAttribute('aria-describedby'),
       );
-      annotationNode.classList.remove('u-hidden');
+      annotationNode.classList.remove('!w-hidden');
       this.commentAdditionNode.insertAdjacentElement(
         'beforebegin',
         annotationNode,
diff --git a/client/src/includes/bulk-actions.js b/client/src/includes/bulk-actions.js
index 6867f870a8..2ea9e2c78b 100644
--- a/client/src/includes/bulk-actions.js
+++ b/client/src/includes/bulk-actions.js
@@ -126,12 +126,12 @@ function onSelectIndividualCheckbox(e) {
     if (checkedState.shouldShowAllInListingText) {
       document
         .querySelector(BULK_ACTION_NUM_OBJECTS_IN_LISTING)
-        .classList.remove('u-hidden');
+        .classList.remove('w-hidden');
     }
   } else if (checkedState.shouldShowAllInListingText) {
     document
       .querySelector(BULK_ACTION_NUM_OBJECTS_IN_LISTING)
-      .classList.add('u-hidden');
+      .classList.add('w-hidden');
   }
 
   if (numCheckedObjects > 0) {
@@ -169,7 +169,7 @@ function onClickSelectAllInListing(e) {
   ).textContent = `${getStringForListing('ALL_IN_LISTING')}.`;
   document
     .querySelector(BULK_ACTION_NUM_OBJECTS_IN_LISTING)
-    .classList.add('u-hidden');
+    .classList.add('w-hidden');
 }
 
 /**
diff --git a/wagtail/admin/templates/wagtailadmin/bulk_actions/footer.html b/wagtail/admin/templates/wagtailadmin/bulk_actions/footer.html
index a25a962d01..eab91d9d32 100644
--- a/wagtail/admin/templates/wagtailadmin/bulk_actions/footer.html
+++ b/wagtail/admin/templates/wagtailadmin/bulk_actions/footer.html
@@ -6,7 +6,7 @@
         <ul class="bulk-actions-buttons">{% bulk_action_choices app_label model_name %}</ul>
         <span data-bulk-action-num-objects class="num-objects"></span>
         {% if objects.has_other_pages %}
-            <button type="button" data-bulk-action-num-objects-in-listing class="num-objects-in-listing u-hidden">{{ select_all_obj_text }}</button>
+            <button type="button" data-bulk-action-num-objects-in-listing class="num-objects-in-listing w-hidden">{{ select_all_obj_text }}</button>
         {% endif %}
     </div>
 </section>
diff --git a/wagtail/admin/templates/wagtailadmin/panels/comments/comment_panel.html b/wagtail/admin/templates/wagtailadmin/panels/comments/comment_panel.html
index 2d62016a12..f12a20f403 100644
--- a/wagtail/admin/templates/wagtailadmin/panels/comments/comment_panel.html
+++ b/wagtail/admin/templates/wagtailadmin/panels/comments/comment_panel.html
@@ -1,5 +1,5 @@
 {% load wagtailadmin_tags %}
-<button type="button" id="comment-icon" data-annotation class="w-field__comment-button w-field__comment-button--reveal u-hidden">
+<button type="button" id="comment-icon" data-annotation class="w-field__comment-button w-field__comment-button--reveal !w-hidden">
     {% icon name='comment' %}
 </button>
 {{ comments_data|json_script:"comments-data" }}