Thanks for reaching out to us regarding this query.
In order to make changes to the padding of the menu, you’ll need to go to Appearance > Theme Options > Header > Menu > Padding Between Menu Items
Once you’re there you can go ahead and change the padding to your requirements.
If you don’t wish to have Rollover then you can just disable that in that same area.
Please let me know if you have any other issues/questions I can help with.