How to make the popup modal appear only once

Hello! How can I configure the popup modal to appear only once every 24 hours or every visit? The modal asks visitors if they are 21 years old or older. However, it currently reappears every time I return to the homepage. I’m looking forward to receiving assistance. Thank you very much in advance!

Here is my site Read-Only: LINK

If it’s a set # of days, like 1 day, you can use SA5’s modal attributes;