how can you open the course menu using a keyboard in rapid typing5
Answers
To open Lesson Editor, click the  tab-button in the top-left corner of the Main window. The screen will appear as shown in the picture below.

The Lesson Editor window is composed of the following controls:
Course and lesson list
Toolbar includes buttons: for adding, removing, inserting (import), and saving (export) existing courses and lessons.
Navigation Tree includes the current keyboard layout choose, current course, section and lesson.
Properties is the area where you can edit course/section/lesson properties.
Editing panel is the area where you can edit the course options or text of the selected lesson in the Navigation Tree.
Table analysis text displays the number and percentage of words, characters, spaces and specific characters in the lesson.
Virtual keyboard highlights the characters used in the selected lesson. Keyboard language depends on the course language; you can choose it in the Keyboard layout list.
Notes
You can always easily hide/show:
Course and lesson list, clicking the  or pressing the Ctrl+K shortcut
Table analysis text, clicking the  or pressing the Ctrl+L shortcut
Properties, clicking the  or pressing the Ctrl+W shortcut
Virtual keyboard, clicking the  or pressing the F9 shortcut