How do I strife in grease pencil

To stay in plane when I am drawing with grease pencil, what is the key + mouse button to move around on the plane and not orbit.

Please see this post: Grease Pencil Merge in Blender 2.8

I don’t know how I missed that…Relatively new here…
Great informative response. thank you C.

Never mind, lot’s of info here and therefor easy to miss s.th.
Glad I could help.