There are 18 different angles you can select. Each change increments the angle by 20 degrees.
The way to select the angle of choice is to use the direction dial on the Paint flyout. You need to use the mouse to gently pull it into position.
The ‘[‘ & ‘]’ square bracket keys will also move the dial, but in larger, 40 degree, increments for each stab. Great for spinning if held down for a random and/or blurry effect, but the mouse is best for finer alignments.
Cheers
Casper