You can “protect” the access to a screen session. Don’t use your usual password, as the method used is pretty weak (standard DES)
Open a screen session :
Inside the session press “ctrl + a” then type “:password”
If successfully set, you should see [ Password moved into copybuffer ] in the lower left corner of the terminal.
Now you can detach by pressing “ctrl + a” then type “d” Reattach with “screen -r” from the prompt.
You should be prompted for the session password.