Inspect the said dropdown.
Set, with Dev Tools, its
99999. If it works, then it means that's the issue and some freaky code got in.
Simply go to either VC's custom CSS or
style.css and add:
If this doesn't work, then it's absolutely something deeper, contact WPBakery.
Okay, this is what you need to do:
Either go into
styles.css at the very end and add this -
z-index: 99999999 !important;
Or in the Page Builder's "Custom CSS" section.
Understand that this is a hack and you really need to investigate more as to why it happens. For me, it's not happening. Definitely you have some custom code over-writing it.
Here' my guess. You're playing with at LEAST one class from these:
vc_ui-panel-content vc_properties-list vc_edit_form_elements
vc_ui-font-open-sans vc_ui-panel-window vc_media-xs vc_ui-panel vc_media-sm ui-draggable vc_active ui-resizable
Which are all parents of that dropdown for the heading style, try to see what's up with these.
The main window has these properties:
.mce-menu.mce-in.mce-animate has a
z-index lower than
50000, then that bug will appear.