After logging in once in Survey123 (v3.10.326) using my organizational account I can't really log out from the app. It seems to have let me leave my account, but when I start the log in process again and choose to log through my organization Survey123 brings me right in without asking for username or password (doesn't matter how many times I repeat the log out process. Even after hitting the log out button, clearing Google Chrome's cache (full history) and closing the app, the problem persists.
Tested in a Samsung Galaxy Tab A tablet and in Samsung Galaxy A20 phone with the same results. The only way I found to really log out is to reinstall the app.