Are these settings at your sources? Then have a look at File, Show Settings Folder and go to basic, scenes.
The .json files contain your scene collection.
So save both the .json and the .json.bak file to another location at subfolder 1. Close OBS Studio, now the files are updated. Save that again to another location at subfolder 2.
You should the able now to put the saved .json.bak 1 back and rename it to .json to restore previous settings.