Thank you for using Mighty Addons.
You can set the responsiveness of the Price List widget by going to Layout > Number of Columns.
You can set the Number of Columns for each device i.e., Desktop, Tablet & Mobile.
For example – You can set the Number of Columns for Desktop = 4 and for Tablet = 2, which’ll resolve the responsive issue for you.
And at the moment, only 8 categories can be used.
Let us know your suggestions so we can improve this and anything else.