Select-Move-Delete
Select
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Click on the black triangle on the lower right corner of the Rectangle Selection combo button to see the options of Selection.
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Rectangle selection : Provides easy selection when the fragments can be drawn around with a rectangle. Hold the mouse button down while selecting; release the mouse when you are ready.
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Freehand Selection : Push down the mouse button and move the mouse pointer around the fragment you would like to select then release the mouse button.
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To select an atom, bond or group, click or select it (with active Rectangle Selection or Freehand Selection tool).
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To select a structure you can double-click on one atom or a bond of it in Selection ( Rectangle or Freehand) mode.
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To unselect, click on an empty place on the canvas.
Move on the canvas
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One atom, or bond:
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Drag it on the canvas while one of the Selection tools is active.
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A selection
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After selection (double click or selection by tool), move the molecule by dragging one of its atom. (See details here.)
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After selection, drag the graphical object by its line.
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Delete
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To delete an atom or a bond click the Delete button on the Tools toolbar then click on the atom or bond, or by dragging you can select the structure you would like to erase.
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You can delete a previously selected area by clicking on the Delete button or by pressing the Delete keyboard button.