Unable to access Course properly

Greetings Team,

When I click on resume course, previously it used to give me the index on the left side of the screen, but currently it’s hidden or disabled & I can only see the last opened page, which for me is a quiz, I’m unable to see the videos at all to revise the topics.
Please assist me, & it’s same for both Data science as well as Deep learning course…

Can you please share a snapshot?