To adjust the axes with your mouse, follow these steps:
1. Select the Axes tool. You find the Axes tool on the Construction toolbar, the Large Tool Set toolbar, or the Tool palette (macOS only). Alternatively, you can activate the Axes tool by choosing Tools/Axes, or context-clicking an empty space on an axis and choosing Place from the menu that appears.
2. Click to place the axes origin point. Typically, you want to set the origin point at the bottom corner of an object in your model. After you click, a dotted red axis extends from your mouse cursor.
Tip: After you place the origin or select your first direction, you can tap the Alt key (Microsoft Windows) or the Command key (macOS) to alternate the axis orientation leading to your mouse cursor.
3. Click to place the red axis, or the axis you chose if you utilize the tip above. You likely want to align the red axis to an edge in your model. When your red axis placement is aligned to an edge, the SketchUp inference engine displays an on-screen cue. After you click to place the red axis, another dotted axis, which represents the green axis, extends from your mouse cursor.
4. Click to place the green axis. If you adjusted your view to see the edge you want to align to the red axis, then the dotted green axis might be hard to see. However, the SketchUp inference engine displays Parallel to Edge inference when you hover over an edge, even if that edge is hidden in your current view.
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