I'm new to Blender, currently using version 4.0.
The answer at Face problem in cube, edit mode on the first paragraph says
Go into edit mode, and press A to select all the vertices. Press the Spacebar and type in
Triangulate Faces, and that should fix the problem.
I try this and when I hit Spacebar Blender goes in to some sort of animation playback loop. What am I missing?
Prior to attempting this I did File / Defaults / Load Factory Settings.

