Any updates on this? The temporary tabs are driving me insane. How to disable it? Jetbrains stopped AppCode IDE so now I have to go back to Xcode. Like Kenny I work in project with hundreds of files.

Yes you can run Xcode 14 on Sonoma. Right click the Xcode 14 app icon -> show contents -> browse Contents/MacOS -> Run Xcode I don't know why Apple puts a stop sign on old Xcode versions when they release a new OS version. Ive been running Xcode 14 since Sonoma came out with no issues. I guess they don't want to spend time supporting older versions if something breaks. I would suggest you uninstall Xcode from App Store and instead use this excellent app: https://www.xcodes.app