Jhc-Toronto wrote:
What button do you push? I used that function all the time and can't find it
Push this button (see picture)

Use Control Center on Apple Watch - Apple Support
DO NOT hold the button, as that brings up the Emergency services display.
Just a quick press and release, and it will bring up the Control Center, with all that same services that you previously got with a swipe up.
If you are having timing issues with the speed of the press and release, then play with
Settings -> Accessibility -> Side Button Click Speed
Feel free to tell Apple the confusing they have caused by moving this UI to a different trigger.
Feedback - Watch - Apple
The more users that send feedback, the more likely a decision maker will see it. After all the swipe left/right users got Apple to change back in watchOS 10.2. Maybe the swipe up users could provide enough feedback to get swipe up restored.