To narrow down which packages appear in the list, select the Filters menu from the Package Manager window.
Using the My Assets list as an example, you can use the following types of filter options to narrow down the list of Asset StoreA growing library of free and commercial assets created by Unity and members of the community. Offers a wide variety of assets, from textures, models and animations to whole project examples, tutorials and Editor extensions. More info
See in Glossary packages displayed:
If you need to start over, click Clear Filters beside the Filters menu to reset all filter options to their default values.