・[Window] → [Package Manager]

・[Advanced](ギアアイコン) → [Advanced Project Settings]

・[Enable Pre-release Packages]にレ点(チェック)を入れる。

・[Packages] → [Unity Registry]

・[Install]

・[Window] → [Package Manager]

・[Advanced](ギアアイコン) → [Advanced Project Settings]

・[Enable Pre-release Packages]にレ点(チェック)を入れる。

・[Packages] → [Unity Registry]

・[Install]
