Oh, I realize I could mate objects (I'm becoming more and more familiar with that ability), but sometimes I just simply want to rotate something 90, 180, 45 deg, (etc)...
Right click on your component & select "Move with Triad", you can then select one of the rotation rings & drag it to which orientation you like using the angular display that appears.
The option may not be visible to begin with so click on the arrow at the bottom of menu to display more options or select Customise Menu & tick the option to make it appear permanently.
Perfect. I forgot about the Triad. It works great.