I think it would work a lot better to save custom filters into horizontal tabs on the Series Page to jump around the filters as needed, rather than click the filter icon dropdown and select a saved custom filter from the list.
Currently, there’s only a visual indication that A filter has been applied and it’s not labeled anywhere on the page. You have to click the filter icon to see what filter is even applied. So having a filter applied by clicking on a dedicated tab is very convenient and you’d be able to see how it’s filtered from the active tab.
Personally, I would save custom filters into tabs for my different output folder locations so I can view all the series together like they’re organized in my media library. I have separate libraries for tv shows, talk shows, wrestling shows, kid shows, anime and I manage them all differently. It would be nice to just jump between these series group quickly.