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Select a youtube resolution and resize the player.
Some other users requested for settings to be saved so that their changes aren't affected by updates. So in your case it had saved 1080p already and will keep using that. If you want to change it, please set the last option "overwriteStoredSettings" to true and then it will update the saved values with what is in the script. Can you please try that?
I recognize that this is a change in behavior, which I typically try to avoid if possible, and other users have had the same issue. I have updated the script to add a comment that hopefully makes this more clear.
Thanks for the clarification, it works.
Always sets to 1080p no matter what resolution you pick