Dear developer,
If you check the "Use Recommended MSAA" option under XR Rig, the MSAA value will be 4X. You can customize the MSAA value after unchecking it.

Could you please consider telling us what effect do you expect and what the effect is now? Is turning on 4X anti-aliasing not up to your expectation or not effective at all?
If the anti-aliasing does not work at all, could you please send a simplified project that can reproduce the problem to our email address?
pico_devsupport@bytedance.com
You can use the title of this post as the subject of your email. We will check it for you.