10,000ft Plans does not include non-working days (Official Holidays or weekends) in your project budget. These non-working days are visualized on the Schedule. The light gray vertical bands on the Schedule represent non-working days and let you see how project timelines overlap with weekends or holidays.
You cannot remove weekends from appearing on the Schedule, but you can change the length of your work week in Account Settings. For example, you might set your work week to be (Monday through Friday) with non-working days (weekends), thereby adjusting ‘Work Days in a Week’ to 7.