How to delete subject

In the main menu click on Subjects. In dialog you can select one or more subjects from the list with using "Shift" or "Ctrl" keys. Then click on "Remove" button and confirm with "Yes".

Note:
- this operation will remove all lessons from these subjects.

If following message appears,

then it means, that one of marked subjects is active. Change the view to "Subjects" and select another subject (simply click in any other row ). Then remove the subjects again.