You can adjust Homey's LED ring to your liking. To temporarily turn off the LED ring, you can create a Flow and make use of the LED Ring block (to turn off the LED ring, set it to the solid color black).
For example, you can use Time as Event to always have the LED ring dim at 10 pm.
Note: If you want the LED ring to appear again in the morning, remember to also add a flow that enables it again, for instance at 8 am.
If you want to permanently alter or turn off the LED ring, you can change its idle mode in Settings → LED ring.