Keep on Top
The Screen Ruler is designed to operate as the topmost window, so that it floats above other software windows such as Astrometrica.
When needing to work exclusively with another window, e.g. when re-stacking images with Astrometrica, the Screen Ruler can be minimised for convenience. The Minimise control is found only on the Screen Ruler window but minimises the Screen Ruler, the Screen Ruler Control and the Magnifier windows at the same time.
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