Package Manager 窗口显示以下内容：
(A) The preview package indicator, which warns you when your project contains preview packages. By default, the Package Manager does not show preview packages in the list. However, you can turn on the Enable Preview Packages project setting to include preview packages in the list.
(B) The add button, which you can click to install a package directly into your project from this window.
(C) The Packages drop-down menu, which you can use to filter which packages appear in the list.
(D) The Sort drop-down menu, which lets you sort the list of packages by name or date.
(E) The Advanced drop-down menu, which you can click to display preview packages in addition to those that have been verified to work with Unity.
(F) The search box, which you can use to look for packages by name.
(G) The packages list view, which displays all packages that match the filter and search parameters you specify.
(H) The package-specific detail view, which displays information specific to the package selected in the list.
(I) The status bar, which displays messages about the package load status and warnings about the network.
(J) The reload button, which you can click to force Package Manager to reload your packages.
|Reset Packages to defaults||选择此选项可恢复为 Unity Package Manager 的默认设置。
|Show preview packages||在包列表中包含预览包。