You can download Persistent Inventory Search on CurseForge and Modrinth:
  CurseForge:   https://curseforge.com/minecraft/mc-mods/persistent-inventory-search
  Modrinth:      https://modrinth.com/mod/persistent-inventory-search
To keep a better overview of all mods, the issue tracker is located in a separate repository.
  For issues, ideas, suggestions or anything else, please follow this link:
    -> Issue Tracker
Because of the way mod loader files are bundled into one jar, some extra information is needed to do a PR.
  A wiki page entry about it is available here:
    -> Pull Request Information
Persistent Inventory Search is a client-side mod designed to make inventory management in Creative mode a lot easier. By default when using the search function, you'll lose the query once a different tab is chosen or when the inventory is closed. What this mod does, is save whatever you've been searching for and immediately show it again when opening the search tab. You can continue to work with your favourite blocks, without having to type their names over and over again. The query is selected when it's shown again, so just start typing when you'd like to search for something else.
Each tab also remembers how far you've scrolled down, so you'll return to the exact spot you left. All features can be toggled separately in the config.
   All available config options:
keepSearchQuery  default true
Whether the creative search query is kept when switching tabs or closing the inventory.
selectKeptSearchQuery  default true
Whether the kept search query is selected, so typing a new search replaces it.
keepSearchTabScrollPosition  default true
Whether the search tab keeps its scroll position.
keepOtherTabsScrollPosition  default true
Whether the other creative tabs keep their scroll position.
What the mod does:
Show Spoiler
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Default behaviour without the mod:
Show Spoiler
You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge or Modrinth ecosystem.
Serilum.com contains an overview and more information on all mods available.
Comments are disabled as I'm unable to keep track of them across so many separate mod pages.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!