MC-3392: Hide Content block/ container from the stage

- Resolve CR feedback

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type-menu/conditional-remove-option.js

@@ -16,7 +16,7 @@ export default class ConditionalRemoveOption extends Option implements OptionInt
     ) {
         super(config);
 
-        const parentContentType = this.parent.parent.parent;
+        const parentContentType = this.preview.parent.parent;
         if (parentContentType.children().length < 2) {
             this.isDisabled(true);
         }

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type-menu/hide-show-option.js

@@ -25,7 +25,7 @@ export default class HideShowOption extends Option implements OptionInterface {
         super(options);
 
         // Modify the icon when changes are made to display in the data store
-        this.parent.parent.dataStore.subscribe(
+        this.preview.parent.dataStore.subscribe(
             this.onDisplayChange.bind(this),
             "display",
         );