Workaround for collinear walls?

[TeenyKitty]

An exterior wall is divided by a bay window. I just discovered, however, that those 2 walls are not collinear -- a 5/8" mismatch.

Not a problem I thought. I'll try that wall alignment button. Select one of them, then the parallel / perpendicular button, then hover over the candidates that Chief offers -- select the other wall.

Checking them out, however, nothing has happened.

Any tips on what I could be doing wrong -- or workaround?

TK