Please note I can NOT give you login credentials to my site because of our firewall rules.
I did some editing on my page using Pro in Safari one day and all was well. Then the next day, many of the elements were missing. Even though I hadn’t touched the computer since the previous day, I assumed I’d deleted them, except that when viewing the page in the browser, everything looked normal. I hadn’t changed anything or updated anything in WordPress, Pro, Safari, MacOS, or any plugins. And everything is up to date with the latest version. So I opened the editor in Chrome, and everything was there. I can’t edit that page at all in Safari, but Chrome works.
The first screenshot below is from Safari. Notice that all you can see is the slider, and the blue “Section 1” label is in the lower left of the editing screen.
The second screenshot is from Chrome. All the elements are there and the blue “Section 1” label is in it’s proper location at the top left of the editing screen.