Sounds like neither Multiviewport nor View Instancing (MMV) is not supported on Mac atm, and the logic in StereoAspects asserts. See attached log from a partner.

Steps to Reproduce

1) Enable Instanced Stereo settings in the project
2) Open it in Mac editor

Observe crash

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ComponentUE - Platform - XR
Affects Versions5.15.25.3
Target Fix5.3
Fix Commit26734672
Main Commit26734651
Release Commit26734672
CreatedJan 12, 2023
ResolvedAug 1, 2023
UpdatedAug 8, 2023
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