These are a few things I miss on the Watch 4 after switching from the Active 2.
@walkerx: When moving to a new device there are always going to be some growing pains, but I'm sure you'll get to grips with things in no time. Regarding the double pressing of the bottom/Home key to assign an activity, head to Settings > Advanced Features > Customize Keys to explore your options. As far as I'm aware, it should still be possible to cover the watch face with your palm to turn off the screen, therefore you might want to check Settings > Display > Always On Display, and disable this feature if applicable. If the screen isn't turning on when your alarm goes off, then check the Quick Panel and disable Theatre Mode, as this stops the screen from turning on for notifications and alarms, so is worth exploring as a potential source of the issue. Let me know how you get on.
Using your palm to turn screen off still works for me on my galaxy watch 4 even though it wasn't in the set up demo. You may need to check some setting but it is possible.
The other issue is that Blood Oxygen does not work for UK users 😞 and no option for continuous tracking during sleep
Definitely one that's wanted. Should hopefully be sorted in the BUH9 update for the Watch though: https://eu.community.samsung.com/t5/wearables/blood-oxygen-sleep-monitoring/m-p/3883100/highlight/tr...