Selection of individual Categorie suddenly dissapeared. It is possible to select Categorie, but not which one.
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after plugin update, you should see the notice at the top Data update required for Post Grid » Update
you should click on update link and the process will automatically be done.
Already created grid you will see the option “Post Taxonomies & terms” please click on each expand icon and will see the options to select categories.
If you can’t access by click on expand button this might be a cache issue, please deactivate cache plugin or clear browser cache.