The phrase "control over one's schedule" refers to having the ability or authority to determine when and how tasks, appointments, or events will be carried out. Full definition
This gives you a lot more control over your schedule and workflow, which is great for people with other commitments like jobs, classes or other things that take up their time. (drive-safely.net)
Control — do you prefer to have control over the schedule of your book, how it gets edited, and the cover design? (advancedfictionwriting.com)
Principals also need greater control over scheduling, discipline, budgeting, use of technology, and instruction. (educationnext.org)