As by @tristup requested I’m starting a new thread about the problem because the solution provided by him in the other thread does not work with Pro, because there is not Cornerstone Plugin that could be removed and reinstalled.
Browser log says:
TypeError: Cannot read property 'mega_menus' of undefined
TypeError: Cannot read property 'matches' of null
when placing the Content Area Modal element on a page while editing the page.
Prior Pro Theme version 4.2.3 it did work (tested with 4.2.2 and Wordpress 5.6.2 / Wordpress 5.7).
It’s just the Content Modal Area element. Navigation Modal and Search Modal have no problem.
Best regards
Mirco