Depends on what you're trying to achieve. If you want to start the page from scratch (or just clean up the list) - then as stated above you can't. But if you need to prepare a different version submission - all textfields seem to be editable when in "Prepare for Submission" state. So you can replace your build, rename the version etc, so basically overwrite the whole page.

Any updates / solutions on this?

Found the mistake on my side. I already had installed release version of the app (same bundle id). Deleting release one did the trick, now I can debug NSE as expected. pluginkit and this SO answer helped

Succeeded to restore the resizing functionality by opening new tab..

Any luck finding the solution?

Did you find the cause and solution for this?EDIT: My current solution is to set SWIFT_INSTALL_OBJC_HEADER: NO, which skips generating swift header. We don't use our Swift code from ObjC, so so far this seems like a legit way.