In the Package Manager window, when you select a feature setA feature set is a collection of related packages that you can use to achieve specific results in the Unity Editor. You can manage feature sets directly in Unity’s Package Manager. More info
See in Glossary from the list panel, the details panel on the right displays details for the selected feature set. The details panel presents the contents of the feature set as a kind of miniature Package Manager window:
(A) When you select a feature set from the list panel, its information appears in the details panel.
(B) The display name of the feature set.
(C) The name of the feature set.
(D) A button to Install or Remove the feature set.
(E) A link to the QuickStart guide for this feature set, containing details of how you can use this set of packages together.
(F) Feature set details tabs:
Feature sets are collections of packages that work well together for a specific version of Unity, which means the Package Manager installs specific package versions that your feature set requires. However, there are a couple of reasons why the Package Manager might actually install a different version (override the requested version):
If the Package Manager installs a version other than the one you requested, an information message explains the reason for the change.