Newbie question about snapping

I accidentally did something wrong which i don’t know what that was. In my front viewport a cursor only snap to curves and objects. It’s not allow me to draw curve on free space. But in other viewport every thing is still normal as it is.

Hello - it sounds like maybe the CPlane is not the expected one in that viewport or the view is looking at the CPlane edge one - run the 4View command twice in a row to reset views and CPlanes - does that sort it out?