Hi Angela,
I don't think that Parameters tab came OOTB in the 12.0 releases. Is that set as a Relationship on Part in your instance?
My best guess would be that it is one of your custom Methods maybe setting the visibility of that tab to hidden or possibly erroring out. If you can get this to reproduce (maybe by signing in as one of the users reporting the issue in a test instance), you can take a look at the browser dev tools to see if there's any obvious error.
It´s still 100% OOTB available in Release 2023 [emoticon:44a8a53ad3364ea78a16c5a3229f75bb]. It works together with the "Class Path" property in "Properties". But it's really not a feature that is used a lot anymore. It survived in our environment since 11SP3 from 2015.
I will try to reproduce it next week, but this behavior is really quite random. Maybe it helps to simulate a "bad internet connection" with the browser debugger.
So it is! [emoticon:9d27520b879541edb4dc3688e695ae44] Thanks for the screenshot. I've looked at the ItemType form so many times, and I've always glossed over that field.
I'll need to install a 12SP7 version myself, but I can take a look and see if anything obvious jumps out to me as to why this tab wouldn't load.
