Thank you for your answer.
Indeed, when I scroll down to the Custom Fields section and use that, the data stays after re-indexing.
However, if I use a Custom Table, the custom fields are not visible in that section, so I cannot select them. I can then only see them in Data Source -> Meta Box -> [CPT Name] Custom Field Label.
According to this thread:
https://support.metabox.io/topic/facetwp-custom-table/
the Integrator supports Custom Tables, so I am a little confused. Of course, I would prefer to use custom tables, when possible. Is it (still) possible to have custom tables with FacetWP?
What is the function of the Meta Box section in Data Source? When would I use that?
Filtering kind of works, but only until I click "re-index"...
Greetings,
Tom
