How do I "grab" just one atom in Real Space Refinement/Regularization?

Cntl Left-mouse-click over an intermediate (white) atom. Drag and drop. Make sure that you have focus in the graphics window when you press Ctrl (which, in Windows, that the graphics window has a blue title bar rather than a grey one).

(You need to means be precise with the clicking - if the view rotates instead of the atom moving then you know that you have been insufficiently precise. More.

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