I have posted before, but I phrased my question incorrectly.
I want to draw a circular shape… that will be extruded into a cylinder… and translate it on the same plane, at a 45degree angle to the original, but have it directly adjacent to the original.
What version of SketchUp are you actually using? Your forum profile indicates SketchUp for Web (Free Only) and SketchUp 2024 Desktop. There is no free only desktop version. The answer to your question depends on the tools you have available and that depends on the version.
Then it’s not 2024 Desktop. Please correct your forum profile.
Probably the easiest way to copy the circle and place it at 45° from the first one is to select the circle, find the vertex at the 45° point and use Rotate/Copy to make a copy rotated 180°.
If you must use the Move tool, grab the circle at the 45° vertex top right and move the copy to the 45° vertex bottom left.