Create Time Registration From List View
If you prefer the traditional Business Central sheet interface, you can use the Time Registrations page instead of the calendar.
Using the New Line Action
Use the New Line action if you prefer the Card interaction similar to what you get in the calendar.

Using the Standard New Action
Alternatively, you can treat the list as any other Business Central list page using the standard New action to create entries directly in the list.
[IMG HERE: Screenshot of the list view with the standard New action highlighted]