Do you see the exposure compensation control on your Xs Max?
No... just checked and it looks exactly like the screenshot you posted. The three circles (far right) will do some filtering, but I don't see any exposure comp settings.
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Upgraded last night and left on charger overnight. Now off charger, battery seems to be dropping a few % every hour even without using my phone. We'll see after a few days but didn't notice this in previous OS updates.
If you've just installed, there is definitely some re-indexing and other housekeeping stuff going on... give it a day or so...