Hey!
This is a classic VRAM (Video Memory) issue. MetaHumans are extremely heavy because of their 8K/4K textures and high-poly geometry, and the Identity/Preview windows usually render them at max settings.
If you want to get rid of that red warning and avoid crashes, try these simple steps:
Lower Scalability: Go to Settings → Engine Scalability Settings and drop it to High or Medium. This affects the preview window too and will immediately free up a lot of VRAM.
Texture Resolution: If you’re working on a mid-range GPU, try using the 2K version of the MetaHuman instead of 8K. You won’t see much difference in the preview, but your GPU will thank you.
Basically, your GPU is just “over budget” by 1GB. Lowering the scalability is the fastest way out. Cheers!