That is possible. I also had a similar feeling, then I adjusted the brightness level. You can adjust the brightness of the display in the settings. I hope that helps.
Hi,
The L and the S are two different sized bracelets.
This link may help you: https://www.fitbit.com/content/assets/surge/surge_sizing_guide_fr_FR.pdf
For the bracelet, I avoid putting it in water, but it's still fabric. so it dries without any problem.
David.