Found this mining Website that has a 12K program to switch any AMD GPU card from Graphics to Compute Mode: https://bitcointalk.org/index.php?topic=2815803.0
Don't know how reliable it is or even if it will work.
From the same thread it mentions that someone made a similar program at GITHUB: AMD.Compute.Mode.Toggle/AMD.Compute.Mode.Toggle/bin/Release at master · gr0d/AMD.Compute.Mode.Toggle...
I recall someone mentioning in the past that Computer Mode was removed because all the newer AMD GPU drivers are already optimized to work in Computer Mode. Don't know how true that statement is or not.
I suggest you open an Online AMD Service Request (Official AMD Support) and ask them directly: https://www.amd.com/en/support/contact-email-form
