I too have similar experience, a vertical green line suddenly appeared on my Galaxy S21FE, my device was in prestine flawless condition, took the device to authorised service centre for repair, it was accepted for repair under the goodwill policy, th...
If all passwords are changed and unique, the warning should eventually disappear in a few days. review logged-in devices and active sessions, remove any unknown apps with account access.
The number keys toggle on Samsung Galaxy may turn off automatically due to layout conflicts, keyboard setting glitches, or interference from themes or other keyboards. This often happens when a non-default layout is selected or due to cached issues. ...