You are confusing the single unit page with course status page.
Note that student cannot access the single unit page in Wplms but instructors and admins can .
To have the layout where whole curriculum loads on one side and unit content on other you have to click on start/continue course button (these button are shown only to user who is enrolled in course) /
check this video up :
https://youtu.be/MFtX9ussRKk?t=44
also check if start course page is set in your wp-admin -> WPLMS -> course manager -> "
take this course page " :
if not then :
Please create a page named start course and select its page template to be " Start course page " and then select this page back in wp-admin -> wplms -> course manager -> take this course page .