Seems a few of us are looking for this answer. I found a post from 2019 and replied there but not sure it'll be seen by anyone. I, as you, used to stay signed in . . . . put the headset on, start DeoVR and it was there . . . ready and logged in. For the last couple of months though . . . . I have to sign in with that virtual keyboard EVERY time I start up the app.
