You can use this checkbox to Simulate by Moves. If unchecked, the simulation is calculated by distance as defined in the Simulation Preferences dialog.
Note: To access this tab activate (i.e., double-left-click) on a loaded g-code file from the Project tab. |
click: 
 G-Code Browser: Simulate, Mode menu item |
1.Check the box to Simulate by Moves. Uncheck the box to Simulate by Distance. The increment for moves and distance can be controlled from the Simulation Preferences dialog. |