I really do love your Plugin Post Grid, but it happens now twice, that after an update of the plugin all the settings are gone. This time even worse, I cannot recover the settings, means no option to select the posts by category, because I cannot choose a category. All posts are now shown.
I am using the free version.
Welcome to our forum.
I am not sure if you already watch this video tutorial?
Please tell me if you still have an issue for selecting categories, please clear cache and try again to click expand icon. it should work, otherwise please check is there any js error on your page.
Let me know the update.