Mark as Reviewed checkbox missing in Repl Teams for Education

I am finding that for some of my repl team projects, there is no checkbox for me to mark as ‘reviewed’. Under the submissions tab it just says (waiting for review).

Is there a specific setting or project setup that would allow me to have the checkbox?
I did have this checkbox available to me when a marked a previous student Repl Teams for Education project. But now even that project no longer has a checkbox for ‘reviewed’.