In mission, how to get gimbal pitch to change

I’m creating mission (using windows) where I want the gimbal pitch to adjust. IN the end, I will want it constant across the waypoints - but I cannot get it to come off 0 (zero) (ie, maybe at 45 degrees) when i add/edit the waypoints. I have the mission setting to “Interpolate”. Then the waypoint setting is also interpolate. But I cannot get the editor to accept anything other than 0 (zero). Suggestions on how to get the gimbal pitch to adjust?

You need to set “-45” degrees. All degrees are given with a minus sign

Thank you so very much. I should have known that!!