Help > System Info doesn't show the amount of graphics memory (VRAM) for some Intel Macs, though Apple icon > About This Mac does. Help > System Info doesn't report the amount of graphics memory for Apple Silicon (M1 and M2) Macs, but that's less important for troubleshooting since their graphics processors share the entire system memory.
Here's a selection of posted outputs from Help > System Info showing the issue:
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