Please refer this Toggle Metal API Validation via your Xcode Scheme: Scheme > Edit Scheme... > Run > Diagnostics > Metal API Validation. It's a checkbox, so the possible options are Enabled or Disabled. Disabling sets the key enableGPUValidationMode = 1 in your .xcscheme file. After disabling, Xcode no longer logs the "Metal API Validation Enabled" log message. Note: In Xcode 11 and below, the option appears in the "Options" tab of the Scheme Editor (instead of the "Diagnostics" tab).