Keep the Watch Screen On

At times, you may want the Redmi Watch screen to stay on when you’re using certain features like a stopwatch or timer. To prevent the display from turning off, you can set a 5-minute screen on time on your Redmi Watch, as shown below.

1. Swipe up on the home screen of the Redmi Watch,
2. Click on the Screen Wake option,
3. Now, the display will not turn off automatically until the next 5 minutes.

Source : wearablestouse.com