- load an image with a segmentation (or create a new one) into the workbench
- open the properties page of the Standard Multi Widget (Windows -> Preferences -> Editors/Standard Multi Widget
- enable Use PACS like mouse mode interaction
- change the left-mouse button action to something else than Pointer, e.g. Zoom
- open the segmentation plugin and select the segmentation
- segment inside the render window and see how the render window changes while drawing the segmentation
This does not happen if the Pointer (crosshair) is selected.