should i leave my bitwarden app open at all times on desktop and android
@Gilles_Boudreau Welcome to the forum!
Generally, you would leave your Bitwarden client apps running and logged in, but not “open” (i.e., unlocked). Lock your apps when not in use (you can automate this using the Vault Timeout settings).
I keep Bitwarden desktop running all the time because I use biometric unlock for the browser extension. As suggested by @grb, I have set it up to automatically lock after 5 minutes of inactivity. Similarly, I never intentionally close or swipe away the Bitwarden Android app, and I have configured it to run in the background without battery restrictions.