This is a paid asset, but now you can download Smart Library for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Smart Library v2.1.2
(Tested with Unity version 2020.3.23f1)
Smart Library boosts your project’s organization by adding the Library window. Allowing you to organize assets in to collections so that you can easily find the ones you want during content creation!
Smart Library boosts your project’s organization by adding the Library window, allowing you to create collections of assets.
Discord: Chat, and get support quickly and submit feature requests.
Forum Thread: Aks question, give feedback, or report bugs.
Manual: Learn the ins and outs of Smart Library.
Roadmap: See upcoming features, and vote for the ones you want to see added most.
FEATURES
Asset Organization: Organize assets of any type (prefab, material, audio, or anything else!) by reference in to multiple collections in the new Library window.
Collections Tree: Collections can form a hierarchy and be reordered and parented to one another for further organization.
Drag & Drop: Drag assets from collections in the library window to anywhere in your project just like the Project Browser.
Rules: Collections have a list of rules which let you define conditions an asset must meet to be allowed in the collection.
Collection Types: There are multiple types of collections to help you sort and organize assets quicker and more efficiently.
Standard Collections: Manually curate the assets in the collect by drag & dropping assets in to the collection in the library window.
Smart Collections: Fully automatic collection that finds assets in the project that match its rules, and removing assets from the collection that no longer do.
Compound Collections: Sources its assets from other collections, and or its subcollections. Works great as a parent to multiple collections.
Extensible API: Use the API to manipulate collections through code and create your own collections and rules to suit your project’s needs.
Undo Support: Complete undo & redo support including creating and deleting collections.
WINDOW FEATURES
Enhanced Previews: Custom previews are generated for assets shown in the Library window with nicer lighting and higher resolution.
Multiple Views: View assets in the Library window in either a grid or list view.
Selection Independent: Selecting assets in the Library window shows them in the Inspector, but will not move the project browser, so you don’t have to worry about losing your place.
Fast Workflows: The Library has full keyboard support, multi-select, double-click to open an asset (or ping – preferences option).
Find What You Want: The Library window has search and order for assets, and more human readable asset names, and small type icon for assets, all to find the asset you are wanting quicker and easier.
Note: For Unity 2020.3 QuickSearch 3.0.0-preview or newer is required! 2021.1 and newer does not require the QuickSearch package.