diff --git a/theme/boost/scss/moodle/blocks.scss b/theme/boost/scss/moodle/blocks.scss
index 686f37aa2ab..6e8ac3970c8 100644
--- a/theme/boost/scss/moodle/blocks.scss
+++ b/theme/boost/scss/moodle/blocks.scss
@@ -30,6 +30,12 @@
     .dropdown-toggle::after {
         display: none;
     }
+    .dropdown-menu {
+        max-width: 500px;
+        .dropdown-item {
+            @include text-truncate;
+        }
+    }
 }
 
 $blocks-column-width: 360px !default;
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 9ed946b3af8..416729a6cf6 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -29595,6 +29595,14 @@ img.icon {
 .block .block-controls .dropdown-toggle::after {
   display: none;
 }
+.block .block-controls .dropdown-menu {
+  max-width: 500px;
+}
+.block .block-controls .dropdown-menu .dropdown-item {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
 
 [data-region=blocks-column] {
   width: 360px;
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 36242d5ee12..9d1660eb787 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -29595,6 +29595,14 @@ img.icon {
 .block .block-controls .dropdown-toggle::after {
   display: none;
 }
+.block .block-controls .dropdown-menu {
+  max-width: 500px;
+}
+.block .block-controls .dropdown-menu .dropdown-item {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
 
 [data-region=blocks-column] {
   width: 360px;