10,000ft does not include non-working days (Official Holidays or weekends) in availability calculations. These non-working days are visualized on the Schedule as light gray vertical bands to let you see how project timelines overlap with weekends or holidays.
By default, the length of a work week in 10,000ft is five days, and the work week begins on Monday, making Saturday and Sunday non-working days. If needed, you can change these settings within Account Settings. Your team may work a 4 day work week with team members being unavailable Friday - Sunday; or you may have various team members working every day of the week. In these instances, you would want to adjust the length of the work week according to your scenario.
In another scenario, some companies consider Friday and Saturday to be weekend or non-working days. In these instances, the start of work week should be set to Sunday.
Manage holidays that don’t impact all locations
Official Holidays have an impact on budgets and allocations, so it's best to only use this for the holidays that span all locations. You can create a special Leave Type, for example "Regional Holiday," and use that on the schedule to indicate who it applies to. Keep in mind that hours on days that Leave Types are scheduled on are not automatically subtracted from the budget. Any time dedicated to Leave would have been considered as available time.
If you need to remove project assignments that overlap with these Regional Holidays, you can click on the Leave assignment In the schedule and then in the allocation menu you can choose "Remove overlapping assignments" to remove any project assignments during that time frame.