Timesheet restrictions

Dear users

I will immediately skip to the question because I am still relatively new to ERPnext.

I need a straightforward adjustment. Juniors should not manually modify their activity times in the timesheet doctype; instead, they should utilise the timer exclusively.

For instance, when someone fills out their timesheet in the morning, they must start the timer and enter the necessary information, such as the activity, project, and task. When they finish their first activity, they must stop the timer, at which point the time should be recorded as “To time” in the timesheet detail.

I want to make it such that the “from time” and “to time” may only be filled by timers rather than the default user permissions, which now allow for manual manipulation.