Apple watch is "stuck" on "Edit Apps". How do I get back to "watch face"?

See the 'Rearrange your apps in grid view' section in:

Organize apps on Apple Watch - Apple Support

1. On your Apple Watch, press the Digital Crown to go to the Home Screen.
2. If the screen is in list view, touch and hold the Home Screen, then tap Grid View. Or open the Settings app  on your Apple Watch, tap App View, then tap Grid View.
3. Touch and hold an app, then tap Edit Apps.
4. Drag the app to a new location.
5. Press the Digital Crown when you’re done.

The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

How to restart your Apple Watch - Apple Support

Restart your iPhone - Apple Support