What's wrong with shear?

I did a shear on a wall edge to swing it around a corner (looking down on top) but then tried to do it again at the next corner and it decided to shear in the verticle direction.

How can I get it to shear consistently in the right view?

If you are in top or bottom view, you can rotate 90 degrees with NUM4 and NUM6 keys.

Otherwise you need to rotate selected vertices 90 degrees before shearing. Use numerical input or restrict the transform with ctrl.

Shear right-up: R -90 enter Control+S 1 enter
Shear left-up: R 90 enter Control+S -1 enter

DiThi, thanks for that. Can’t try it just yet (at work, makin’ money not fun!)