How to enable deformation batching?

Unity Engine
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1

Hello, I’m using Unity2021.1.3f LTS, I have some bones in a sprite, and the Editor prompts “Install Burst and Collections packages to deformation batching”, I’ve updated Burst package to the latest version, but can’t find Collections package, so the check box is always deactivated.

Please see the attached screenshot.
How can I enable the check out so I can’t enable batching? Or is it already enabled?

Thanks very much.

8637618--1161567--Batching.png

2

This is the physics forum, it’s not related to your cross-post of How can I find the Collections package in Package Manager?

Please don’t cross post.