Ok, I thing I figured out the issue.
WPDM works only with the permalink’s structure setted to %postname%
In my first installation, unfortunately, elementore doesn’t work with that type of permalink structure.
I tryed some new installation, either offline or online with permalinks setted on plain and WPDM doesn’t work.
Now I done a fresh install of wordpress offline with permalinks setted on %postname” and WPD works correctly.
I don’t know if this issue can be solved.
I mark this thread as “Resolved” if I can.
OK, just tried, the issue is still here. The “search bar” give me a blank page with only the header.
Thank You Sagar, tomorrow in the morning I’ll try this solution and let you know It It works.
In the meantime today I tryed to use another widget that includes a filter option and It has the same issue of the search bar.
I Just tried With a fresh installation. The issue is the same. Maybe because of ann elementor updates?