Hi @goluboy!
I am sorry but in the FREE version we have no option to filter posts by fields, what we have is the “Posts By Filter”. Which can filter posts by Categories/Tags/Custom Taxonomies.
In the Pro version we have some additional options to filter posts by comparing meta key values with user input. However the Pro version can not be supported on this forum.
Here you can find out more information about Filtering options in Smart Slider 3:
https://smartslider3.helpscoutdocs.com/article/139-wordpress-posts-generator#filter
If you would have some questions related to the Pro version please contact with us directly on: https://smartslider3.com/contact-us/presale-questions/
Best regards,
Laszlo.