How do you use the compass as a scope to zoom in?

[True-Verum 0]

I've seen some streamers do this, it seems useful but I can't figure out how to do it.

[Savetti 7]

I think you press the left cntrl button while you have the compass selected. Im not online right now, so i can't verify, but it's something like that.

Edited December 26, 2018 by Savetti
Spelling error