I would want to choose Mac Metal Desktop Renderer without Tessellation aka SF_METAL_SM5_NOTESS but default is Mac Metal Desktop Renderer with Tessellation aka SF_METAL_SM5.
If I just disable SF_METAL_SM5 from targeted RHIs list game will crash at start up. We are not using tessellation so just SF_METAL_SM5_NOTESS would be perfect. Supporting both increase packed size quite a lot.
We are having this exact issue in December of 2020. I like that this question, like countless more on here, was asked over 4 years ago with zero responses. Very helpful.