The current "Exit Course" button on the top right is not an effective solution for this problem.
The previous idea "LMS-I-2696" has been marked as "Currently available."
Although the plain "X" has been enhanced to read "Exit Course X", that does not rectify two issues:
While in a course, this button STILL gives off the impression to users that progress could be lost. There needs to be a "Save and Exit" button available.
When a course is completed, the "Exit Course X" is still fairly inconspicuous to users. There needs to be a dramatically obvious button that appears in the middle of the screen like the "Review" button that instead reads "Exit Completed Course and Return to Dashboard." (Or something equally obvious, clear, and intuitive to new or occasional users.
I repeat, the solution provided for LMS-I-2696 is not effective.
Seconded, there is a bit more work to do here to make this solution both accessible and satisfactory for learners. You can change the message that comes up via the Translations menu to remove or change that loss of progress message, but that is not a satisfactory solution here.