How do I create a 45 degree guide in Illustrator?

Question

Adobe Illustrator

Look, I need 2 guides - a diagonal, i.e. at a slope of 45 and 315, respectively. I create guides only by dragging them from the rulers, for some unknown reason I don’t press the button under any circumstances, it is marked as non-working:

Answer 1

Draw a line at an angle of 45 degrees, select it, call the context menu with the right button - Create guides.