Q: Help! My watch is stuck in the modular face!

If you are pressing firmly in the center of the screen and are just getting the calendar, then try rebooting your device. Hold down the crown and the lower button together for about 20 seconds. After the device has rebooted, trying pressing down on the watch face to see if the customization screen comes up.

See if, "force" restarting your watch helps ...

Press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.

Hi

Apple recommends that you do not force restart your watch (by holding down both buttons) unless it has become completely unresponsive, which is not the case with your watch.

It may instead help to restart it normally:

• Press and hold the side button until you see the Power Off slider; drag the slider to turn off (wait for it to do so); then press and hold the side button until you see the Apple logo.

More information:

Restart your Apple Watch - Apple Support

Having experienced exactly the same issue - and after having tried troubleshooting steps including restarting and re-pairing their watch - another user needed to have their watch serviced by Apple:

I cannot change my watch face from the Modular Face, the 'firm press' is not working anywhere I press.

If restarting your watch does not help, next try unpairing and re-pairing your watch:

• Unpair your Apple Watch and iPhone - Apple Support
• Set up your Apple Watch - Apple Support

If the issue persists (which it may), I suggest that you contact Apple Support (mail-in service may be available) or make a Genius Bar reservation with a view to having your watch serviced (under warranty, if eligible):

• Contact - Official Apple Support
• https://twitter.com/applesupport
• http://www.apple.com/retail/geniusbar/

To check your warranty status (the serial number is on the back of your watch):

https://checkcoverage.apple.com/

You're most welcome - good luck!