ImageSize (1) 

Specify the size of the locator in graphics coordinates:

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GuideDirections (2) 

With the default setting "GuideDirections"→Automatic, the locator is movable along the 3 cardinal directions:

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Constrain the locator to the xy-plane:

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ShowGuides (2) 

With the default setting "ShowGuides"→True, guide lines and planes are shown when manipulating the locator:

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Hide the guides instead:

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AllowedActions (2) 

With the default setting "AllowedActions"→Automatic, the set of allowed actions depends on the other settings of the locator. With nothing else specified, "MoveAlong" and "MovePerpendicular" are allowed:

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With explicit guide directions specified, "MovePerpendicular" is no longer enabled to force the movement along the specified directions:

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Specifying a rotation matrix enables "Rotate" as well (and changes the default appearance to a cube):

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Allow only rotation:

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ModifierKeys (1) 

With the default setting "ModifierKeys"→{None,"ShiftKey","OptionKey"}, the first allowed action requires no modifier key, the second one the -key, and the third one the -key (Windows/Linux)/the -key (macOS):

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RotateGuides (2) 

With the default setting "RotateGuides"→False, the guide directions are kept axis-aligned, even when the locator is rotated:

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Rotate the guides, keeping them fixed to the coordinate system of the locator:

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