How to Use Only ONE Earbud
If your TWS110's batch is before 20B1: Only the RIGHT-side earbud can be used independently with your devices. The left earbud does not have any pairing capabilities other than with the right earbud.
When using the RIGHT earbud alone, you can skip tracks, turn up the volume, answer and end calls, and activate your device's voice assistant. If you wish to turn the volume down or go to the previous track, you must do so on the device itself.
Pair the single RIGHT earbud to your devices in the same way as when you are using both. You can refer to this guide, and simply disregard all of the steps concerning the left earbud.
If your TWS110's batch is 20B1 or later: Both the RIGHT and LEFT earbud can be used independently. Just take either of the earbud off from the charging case, and wait until the led flashing red and white alternately, at the same time you will hear the voice prompt says "pairing". And then pair with your device.