Ticket #49461: 49461.patch

src/wp-admin/css/themes.css

@@ -184 +184 @@
         opacity: 1;
 }
 
+@media only screen and ( min-width: 769px ) {
+        .theme-browser.rendered .theme:hover .theme-name,
+        .theme-browser.rendered .theme:focus .theme-name {
+                width: 40%;
+        }
+}
+
 /* Current theme needs to have its action always on view */
 .theme-browser .theme.active:focus .theme-actions {
         display: block;