This can be done in two ways: in the calendar or in the schedule view.

Entering the form in the schedule:

Select a specific day on which you want to indicate the form of work. If you are planning working time, choose the appropriate working time rule. From the dropdown list, select the available form of work performed. You can also use the FORMS OF PERFORMED WORK tab in the working time modification window. From the available list, choose the appropriate form. If the schedule has already been planned, go to the FORM OF PERFORMED WORK tab on the selected workday and choose the appropriate form from the available list. The list will display only the permitted forms for the selected working time rule.

Entering the form in the schedule view:

Click the CELLS SELECT button in the top panel. Select the days on which you want to enter the form of work. Click EDIT SCHEDULES in the bottom right corner. In the window that appears, go to the FORMS OF WORK PERFORMED tab, choose the appropriate form, and confirm by clicking OK.

You can find more information in the article: Entering the form of work performed