If your watch is responsive, you can use the software menu. If it's frozen, use the hardware "force restart" method. Swipe down from the top of the watch face. Tap the Settings (gear) icon. Scroll down to System and tap it. Tap Restart and confirm with the checkmark.
For non-rechargeable hybrids, removing and reinserting the coin-cell battery effectively restarts the device. Fossil Gen 5 LTE Smartwatch - Restart Device - Verizon restart-fossil-watch
Hybrid watches like the Monroe or Collider often require a longer press for a soft reset. If your watch is responsive, you can use the software menu
If your watch is stuck showing only the time to save battery, press and hold the middle button until the watch vibrates to reboot back into the full Wear OS. Restarting Fossil Hybrid Watches Tap the Settings (gear) icon
Whether you need a quick refresh for a sluggish interface or a hard reset for a frozen screen, there are several ways to restart or reset a Fossil watch. The process varies slightly depending on whether you have a touchscreen smartwatch, a hybrid, or a traditional chronograph.
Press and hold the middle crown button for about 10–15 seconds. Release the button once the Fossil logo appears.
Press and hold the middle button for roughly 5 to 10 seconds. The watch will vibrate, and the hands may spin before returning to the home screen position.