Doc:Glossary/Left Mouse Button

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Left Mouse Button

Left Mouse Button; click LMB or click and drag LMB works as in other applications to select from menus and tool bars, move objects, drag box outlines, etc. However, an accidental click on LMB while traversing it over the 3D viewport can inadvertently invoke the Gestures option (see the section of that name in the User Manual Chapter on Interaction in 3D) for initializing a manipulation. This may result in unwanted changes in objects or elements of objects in position, angle, or scale. If this happens, cancel the manipulation by clicking RMB or use Ctrl-Z after clicking LMB.