Hi,
1- If the “url depth” setting is conditioned on the previous setting (“disable page indexing”) being marked as “yes,” then when it is marked as “no,” this setting should be disabled. This is basic usability and user experience. I have been inquiring about this while the option was marked as “no,” rendering the “url depth” setting useless. The usability and texts of the plugin are quite deficient in this regard.
2- Now, following your suggestions, I have marked “disable page indexing” as “YES,” but now all filter pages are noindex. I set the “url depth” option to 2, and whether applying 1, 2, or 3 filters, the page is always noindex. Thus, in this case, the “url depth” setting does not work either.