Whether it's switching off public holidays in your planning, or working an occasional extra Saturday. In the timeline you can also switch on unavailable days as planning days or switch off working days.
The way to switch days on or off in your planning is simple. Open your timeline and move your mouse to one of the default work days. A button will appear that allows you to disable the day as a plan day:
The day is switched off as a planning day. This has a direct effect on the capacity graph.
Extra tip: By using guides in the timeline, non-schedulable (switched off) days will be displayed more clearly. To enable guides, click on this button at the top of the timeline menu bar: