Diagram Magnifier
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The magnifier can be controlled using the following shortcuts:
Press M to show / hide the magnifier.
Hold down+Z to temporarily show / hide the magnifier.
Use Shift+Scroll Up/Down to change the zoom of the magnifier.
Use Ctrl+Scroll Up/Down to change the size of the magnifier.
Use Ctrl+0 to reset the zoom and size of the magnifier.