Where I work just switching into a TTY would be enough to keep anyone out.

Whatever comes with GNOME/gdm.

Kscreenlocker because it came as default and I made it look identical to sddm

Swaylock, but the one with effects. Using it to leave a blurred picture of the current screen without anything readable. Works well for two years now, is wayland only

I use i3 lock, scrot and imagemagik to make my lock screen a blurred version of my actual screen

By screen locker, what do you mean exactly? Do you mean a setting that automatically locks your screen after a preset amount of time? If so, yes I do.

I just use XScreenSaver because I haven’t ever looked into changing it.

slock. i don’t really use anything else from the suckless people, but i like how minimal slock is

None.

Why? Erm, living by myself I don’t need to lock myself out ;)

I’ve always used i3lock. I also made a script to randomly select a background. Plus the login password circle thing looks cool. Would definitely recommend.

Whatever one comes with Manjaro KDE.

Because I don’t really care.

None currently, because I live with my family and if I wanted to hide anything from them (which I don’t), I could just switch to a tty, or log out. Most of my work is done in VSCodium or Vivaldi, which save their sessions, although I have considered doing one just in case.

Waylock, because it keeps sway locked even if the screen locker crashes.

SDDM 0.20 Wayland mode is awesome!

Physlock because it locks the other vts as well.