Ah, yes, .ass. The perfect name for a format mainly used by anime.

Aegisub is better for creating/editing .ass subs primarily for anime

Subtitle edit is great for editing .srt subs, ie. remove SDH, fix common mistakes, OCR PGS subs and timing to 4k/HDR video files.

TinyMediaManager v3 (free) for file renaming/ nfo creation.

Mkvtoolnix for single file remuxing

MKV muxing batch GUI, for batch muxing

JMkvpropedit for batch editing of file properties (defaut tags, attachment names etc.)

MKVcleaver for de-muxing batch files

Mediainfo for viewing file properties

Great links. Thanks for sharing!

Subtitle edit uses some unique identifiers for positioning and line breaks, which sometimes break with ass subtitles made with aegisub (what almost all fansubbers use), so use aegisub: https://github.com/arch1t3cht/Aegisub/releases
Filebot is also better suited for custom presets with support for diverse metadata providers: https://github.com/barry-allen07/FB-Mod
mkvtoolnix is neat but you have to know what you're doing: https://thewiki.moe/advanced/muxing/

Not quite sure what you're aiming at, but are you expecting the search function to behave differently if one is on the Series on Episodes page?
If so, how would you expect them to operate?

Information shoud be free, if you need it.
Free Softwares i use to manage my collection:
you can get it from here: https://www.videohelp.com/

SubtitleEdit-4.0.2
- Join and edit subs from other videos e.g. Edit Dialogue to Signs & Songs
PS: you can translate subs to your languague.

Rename My TV Series
- Download and rename all filename in the folder e.g Deaimon Recipe for Happiness - S01E01 - Nagomu and Itsuka

mkvtoolnix - GUI Version
- Edit/join and set file attributes:
- correct audio or video delay
- extract and add subs from another file
- set default language priority, etc..

LosslessCut-win-x64 Chapter Editor
- Add or edit chapters in video file.