I did not open the ComputeVTK yes in my input parameter for GCMC simulation but I don't want to redo the whole MC simulation again so after the simulation finished, can I change the directory 'Restart' to 'RestartInitial' with ComputeVTK yes input parameter to save time on simulation?
Using a Restart-file will save you the equilibration phase. Usually it is best to check your simulation after submitting to make sure the options are set.
In the output, it lists the input-settings so you can check whether options are on or off.
Also, most files are periodically updated so you can see the current results.