Since I sit in the right seat of an RJ I usually keep my mask on during boarding in an attempt to “set a good example” for the pax since they can see me as they board due to the entryway angle. Probably not worth much but have heard of incidents where pax took off masks and talked back to FAs claiming they saw the pilots not wearing masks. Mask off for preflt briefing or talking on radio though, difficult to hear a briefing through a mask over all the fans.