diff --git a/src/bundle/Resources/public/js/CKEditor/custom-attributes/custom-attributes-command.js b/src/bundle/Resources/public/js/CKEditor/custom-attributes/custom-attributes-command.js
index b0a5fd68..d3f6fc9b 100644
--- a/src/bundle/Resources/public/js/CKEditor/custom-attributes/custom-attributes-command.js
+++ b/src/bundle/Resources/public/js/CKEditor/custom-attributes/custom-attributes-command.js
@@ -28,7 +28,7 @@ class IbexaCustomAttributesCommand extends Command {
             const hasOwnCustomClasses =
                 elementCustomClassesConfig &&
                 selectedCustomClasses
-                    .split()
+                    .split(' ')
                     .every((selectedCustomClass) => elementCustomClassesConfig.choices.includes(selectedCustomClass));
 
             if (elementName === modelElement.name || hasOwnCustomClasses) {
diff --git a/src/bundle/Resources/public/js/CKEditor/custom-attributes/ui/custom-attributes-form-view.js b/src/bundle/Resources/public/js/CKEditor/custom-attributes/ui/custom-attributes-form-view.js
index c700c296..610743b9 100644
--- a/src/bundle/Resources/public/js/CKEditor/custom-attributes/ui/custom-attributes-form-view.js
+++ b/src/bundle/Resources/public/js/CKEditor/custom-attributes/ui/custom-attributes-form-view.js
@@ -209,8 +209,8 @@ class IbexaCustomAttributesFormView extends View {
         addListToDropdown(labeledDropdown.fieldView, itemsList);
 
         this.listenTo(labeledDropdown.fieldView, 'execute', (event) => {
-            const alreadySelectedValues = labeledDropdown.fieldView.element.value ? labeledDropdown.fieldView.element.value.split(',') : [];
-            const value = config.multiple ? [...new Set([...alreadySelectedValues, event.source.value])].join(',') : event.source.value;
+            const alreadySelectedValues = labeledDropdown.fieldView.element.value ? labeledDropdown.fieldView.element.value.split(' ') : [];
+            const value = config.multiple ? [...new Set([...alreadySelectedValues, event.source.value])].join(' ') : event.source.value;
 
             labeledDropdown.fieldView.buttonView.set({
                 label: value,
diff --git a/src/bundle/Resources/public/scss/_balloon-form.scss b/src/bundle/Resources/public/scss/_balloon-form.scss
index c5d0b88f..aa644b81 100644
--- a/src/bundle/Resources/public/scss/_balloon-form.scss
+++ b/src/bundle/Resources/public/scss/_balloon-form.scss
@@ -25,6 +25,7 @@
                     .ck-button.ck-dropdown__button {
                         .ck-button__label {
                             width: calculateRem(198px);
+                            display: inline-block;
                         }
                     }
                 }