Well, I tried this and the “Mark as complete” button still is not showing on desktop.
In this case, this is specially important in lessons that doesn’t include videos, because the user has the “prev – next” buttons, but not the “mark as complete”, so when you press “next”, the lesson isn’t marked as complete but you continue to the next lesson.
As I told you, this doesn’t happen on mobile version, because the progress bar and the “mark as complete” button appear either when the courses are on strict mode or in flexible mode, according to the settings.
Can you check if it’s not a bug on the plugin? Thank you!