Enabling team members to manage their timesheet in Company settings automatically grants them mobile time entry permissions, ACHS1.
To disable this feature, first uncheck the box for "Allow team members to manage their own timesheets," and then turn off "Allow team members to track time on the mobile app."
Here's a visual reference for guidance:

For more details on managing time entries in QuickBooks Time and other features like mileage tracking, refer to this article: Change QuickBooks Workforce settings and permissions.
Also, explore this resource on QuickBooks Time reports, including the Wage report, which provides insights on hours worked, pay rates, and total wages: Learn about QuickBooks Time reports.
If you have further questions about managing time entries in QuickBooks Time, feel free to return to this thread, and the Community will assist you anytime.