Auto-Select feature, it's great, but I would like to know how to effect different Auto Select, for example for rssA I set the Size Threshold to 30, but for rssB I would like to disable this feature or set it to 10.

I didn't find any documentation or functionality for this.

please tell me how to do it.

Thanks!

Look here: https://support.tixati.com/file%20auto%20select

and here settings-transfers-files
press configure button for 'Auto-select files in new transfers'

Thanks for the reply, the page you are talking about appears when you add a torrent manually. Rss which adds torrents automatically does not have this page.

Currently, I only use “Default Preset for New Transfers”, so I'd like to know if there's any other way to automate different presets for different torrents!

You could try using categories.
use different auto-select presets in different categories.
send rss downloads to different categories

you could also turn on the prompt window for rss downloads
settings-user interface-behavior
press configure button for 'Transfer loading priority/location prompt'

Aha, categories, I didn't realize this existed until saw your reply!

Thank you very very much!