The item can be picked up and dragged but its impossible to drop it in the required location, it just returns back to its original place.
Mac version build 129.348
Attachment Screenshot 2020-11-16 at 134548.png added
Just for the your information, I can drag and drop in Algo Wizard in build 130 so it does work in this version. So Im not sure why it doesn't work in the main SQX.
It is an issue of the embedded JxBrowser. We are testing every new version of JxBrowser, hopefully they will fix it in the future.