The contents of the canvas can be reduced or magnified at will with the Zoom In/ Zoom Out buttons on the General toolbar. The zoom ratio can be changed by rolling the mouse wheel, where the center of the zooming is the position of the cursor.
The Zoom All
Enter shortcut can also be used for this purpose.
The Zoom to Selection button on the same toolbar (or the
Ctrl+Enter keyboard shortcut) increases the zoom ratio, placing the selected object in the center. The Zoom to Selection button is only available when there is active selection on the canvas.
When the selection contains only a fragment, the molecule will be distorted due to the changes in bond lengths and bond angles.
When a structure has been selected, it can be rotated around its center in two dimensions. A pink circle with a dot is indicating the center of the selected area (pivot point). The molecule can be rotated around this point by clicking on the blue dot and dragging the cursor on the canvas. During dragging, you can see the angle of rotation near this blue dot. By default, rotation is done in 6° increments. For continuous rotation hold down the
Shift button while rotating.
When a whole molecule is selected, the original center of rotation can be relocated by dragging. In this case, if the new rotation center is too close to its original position, it will be snapped back to it. However, pressing the
Shift key while dragging the center of rotation allows it to be as close to its original place as you wish. Moving the center lets you rotate the molecule around any point of the canvas. The image of the starting structure remains displayed in grey during rotation.
When a selected part is only a fragment which connects to the rest of the molecule with one bond only, you cannot move the pivot point (which is gray in this case). In such cases, the center of rotation will be the atom that connects the selected and non-selected parts of the structure.