Master Password Login not fully hidden on Android


I use Bitwarden on Android. There, when I login with my master password, when I type it I can see the letter I just typed appearing on my screen before being turned into a dot.

  1. I used an app which said it was monitoring my screen to block apps I didn’t want to open (To avoid watching youtube after a certain time). Does it mean there is a risk this app could have seen and recorded my master password as I typed it? (Or the bitwarden text files I opened?)
  2. In the future, how can I disable the feature of the letter being shown before it turns into a dot?