I have a benq monitor with 144 Hz and 1 ms response time
however, the fps value is set to 60 fps for all games like warzone or fortnite.
shouldn't I set the value to 144 fps if I activate v-Sync?
Only if the computer achieves more than 144 fps and you have set v-sync to 144, if that is possible. Otherwise, it is a constant 60 fps, which is enough.
What hardware? If it's always at 60fps, you've got something limited.
Have good hardware is not because
It doesn't do it