(Neither affect the number of 'active plugins' you have in your load order.) In that case, please see the ' Checklist Item #23' entry of the wiki ' Fallout NV Mod Conflict Troubleshooting' article.
There are a couple of alternatives for that option.
I'm assuming you do NOT want to use a 'fake fullscreen windowed mode', which makes the game look 'fullscreen' while being in 'windowed mode' so you can still use ''.