Placing boxes on plots in OYSTER is done as follows after this mode has been initiated by a widget button: a new box is started by clicking the left mouse button. This click anchors a corner and moving the mouse (drag is not required) will change the size and shape of the box. To fix size and shape, and change to a mode which moves the entire box, click the middle button. This will enable you to reposition the box more precisely if needed, even though the size cannot be changed anymore.

At this point, i.e. when the box has been placed, further action depends on the function of the button which was used to start the box placing mode.