How to allow one worker to complete HIT multiple times

Hi all - when I set up a new Project, you can - on the first page - set the "number of respondents" i.e. the number of unique workers (quote: "How many unique Workers do you want to complete your survey?"), but there is no longer any place to set the total number of assignments.

We would like to set lots of assignments, and allow individual workers to complete as many of them as they want - is there no longer a way to do that? Thank you!
-Darin