brook In the main profil, go in settings > system > users > the profile you created > enable "Allow running in background".
Then, once in this secondary profile, do not "end session" by pressing the power on/off button, slide from top to bottom, press the “profile” icon on the bottom right and choose the owner profile if you wish to return to the owner profile, without switching off the secondary profile, it will then ask you to enter only your fingerprint if you return to the secondary profile, or the fingerprint + the second factor PIN if you have configured it.
Note that by doing this, the data in the other profiles is not at rest, and you increase battery consumption.
brook Work Profile current works way better in this regard, it does not require entering password on each application switch, while it's also a separate user in the system.
It's not as isolated as the system-wide user, recently GrapheneOS has enabled users to put data to rest when they leave Private space, as they would with “end session” for a secondary profile, in which case you have to re-enter your PIN.
PS : There's no point in writing in big, bold letters - it doesn't make the text more legible, but gives the impression that it's an absolute emergency.