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Stay on top

At times, you want the ruler to stay on top of the items you are measuring.  In such cases, use the Stay on top toggle feature, which can be accessed by bringing up the Options Dialogue Box using the Ctrl + O key combination or via the context menu.

Alternatively, the Stay on Top feature can be toggled via the F5 key.

When Stay on top is active, the border becomes thicker to indicate the option is active.