If you are registered as a Trainee, you have the option to view your trainers' rosters by clicking the "Graduation" symbol.
You will then see your trainers' shifts in the published roster. If trainers are also present for overtime work, you will see this in a data-corrected manner. The fact of the overtime is therefore not shown. Likewise, a sick trainer is simply not shown.

As a Trainee, you have the option to enter and delete shifts in an already published roster. You can therefore design and change your roster yourself.
However, this option must be unlocked by the planner.