How does Unity delete the Package package imported by Asset Store

Sometimes the material package downloaded from the store is too large or no longer needed. How to delete it to release the disk space?

Although there is no delete option in the app, you can delete the directory directly from the file manager, and then you will find that the Package Manager shows that the package needs to be downloaded again!
C:\Users\Username (maybe a string of numbers)\AppData\Roaming\Unity\Asset Store-5.x

Note: Be careful not to delete what the project needs~