As with the master data windows the lessons window is also divided into two sections: the grid view, which lists the lessons in a table, and the form view, containing all the fields that can be entered for a lesson. You can use the arrow button at the bottom left of the screen to expand and collapse the form view.
The most important fields are shown in the grid view by default. If you wish to display a field, use drag & drop to pull it from the form view into the grid view. Hold the <CTRL> key pressed and drag a field from the grid view into the form view if you wish to hide it.
In the form view you can enter all possible data as masks. All entries made here are immediately displayed in the grid view, and vice versa.