On the levelmap, you can easily switch between your courses. Go to the lessons overview by clicking on the tab 'Lessons'.
When you click on the title of the course - under "Select your Course" - a drop-down menu will open. In this menu, you will find the titles of the other courses.
Click on the title of the course you're looking for, and you've switched environments!
Don't worry about losing your progress, everything is saved.
If you cannot find your course in the drop-down menu, please contact us through the chat (round button in the bottom right corner of the page).