diff -u b/core/profiles/demo_umami/themes/umami/css/components/forms/buttons.css b/core/profiles/demo_umami/themes/umami/css/components/forms/buttons.css
--- b/core/profiles/demo_umami/themes/umami/css/components/forms/buttons.css
+++ b/core/profiles/demo_umami/themes/umami/css/components/forms/buttons.css
@@ -4,13 +4,20 @@
  */
+
 .form-actions {
-  display: inline-flex;
+  display: flex;
+  flex-wrap: wrap;
+  margin: -0.5rem;
+  padding: 0.75rem 1rem;
 }
-.form-actions .button {
-  margin-left: 1em;
+
+@media screen and (min-width: 77em) {
+  .form-actions {
+    margin: 1rem -0.5rem;
+    padding: 0;
+  }
 }
-.form-actions .button:first-child {
-  margin-left: 0;
-}
-[dir="rtl"] .form-actions .button:first-child {
-  margin-left: 1em;
+
+.form-actions > input.button,
+.form-actions > .form-wrapper {
+  margin: 0.5rem;
 }
reverted:
--- b/core/profiles/demo_umami/themes/umami/css/components/layout_builder/layout-builder.css
+++ /dev/null
@@ -1,3 +0,0 @@
-[class$="layout-builder-form"] #edit-preview-toggle {
-  margin-left: 1em;
-}
reverted:
--- b/core/profiles/demo_umami/themes/umami/umami.libraries.yml
+++ a/core/profiles/demo_umami/themes/umami/umami.libraries.yml
@@ -36,7 +36,6 @@
       css/components/regions/header/header.css: {}
       css/components/regions/pre-header/pre-header.css: {}
       css/components/toolbar/toolbar.css: {}
-      css/components/layout_builder/layout-builder.css: {}
     layout:
       css/layout/grid-2.css: {}
       css/layout/grid-3.css: {}