None of the ideas you gave worked, but thanks anyway. It resolved on its own, and if you encounter this issue, the solution is simply to wait — it gets fixed after 24 hours.
@yourfriendkarol
Currently no, you can use custom interface if you have BAS premium using your third-party to resize them. How ever, setting the startup window size for either interface is not a feature yet. fingers cross hope it comes soon tbh!