On my staging site I have recorded video of the two Dokan product category widget I can find available but neither of them look like the one from your demo website for Redokan https://www.loom.com/share/28e8da253098430fba3a8a37c18b0969
The first one does not have a heading? and when you click on a product it navigates to the shop page which does not seem correct for a vendor store product category widget.
The second widget has a heading but the format does not seem to match the other widget on the sidebar? It is also very untidy format.
How do we use the product category widget on your demo website? see screen shot for example https://www.dropbox.com/s/u4dyk30be2uob5v/Screenshot%202021-09-21%20at%2013.45.49.png?dl=0
It look simple and only show product of vendor on page and does not navigate to main shop page which is what I want. I am using second widget from video on live site at the moment.