Using Sketchup Pro 2019 on a MAC …
I have a simple cabinet (made of component parts) with Width on Red Axis, Depth on the Green and Height on the Blue.
I select the parts and create a component.
I context click … choose Change Axes to move the axis to the back-left corner (to assist in future placement).
I set the red and green axis … but the blue axis is facing “down” (i.e. away from the cabinet).
I cannot seem to figure out how to get the blue axis to face up? And, if I context-click and select the blue axis to adjust - then one of the other axis points “away” from the cabinet.
The help page says “pay attention to the other axis” … I cannot seem to get the “other axis” to go in the intended direction!