Just need to write: bios_patching true in the ~/config/settings/kernel/drivers/vesa file.
But again… AFAIK… this will only work if you are using BIOS boot mode (sometimes called “Legacy” or “CSM”) and not UEFI.
If the Screen preference app shows “Framebuffer” then you are still using UEFI as boot mode, and the vesa patching is irrelevant on that case (for it to have some chance of working, the Screen preflet should say “VESA” instead).