GNU/Linux Mint 19 Installing Radeon RX 5600/XT Driver
How to Install AMD Radeon RX 5600/XT Driver on GNU/Linux Mint 19.x Tara/Tessa/Tina/Tricia LTS desktop – Step by step Tutorial.
And there are two Mint 19 Radeon RX 5600/XT Graphics Driver available Alternatives: the AMDGPU Pro and the AMDGPU Open-Source.
Moreover, the AMDGPU Pro Software includes Support for Accelerated Graphics, MESA Multimedia, Pro OpenGL, Pro Vulkan and Pro OpenCL.
Especially relevant, the Latest Driver supporting a Device varies over Time, so before the Setup you should check: AMD Radeon Drivers Support
Finally, for the Radeon Open Source Drivers on Repo See instead: How to Install AMDGPU from Mint PPA.

Installing Radeon RX 5600/XT Linux Mint 19 Driver
How to Install Radeon RX 5600/XT Driver on Linux Mint
Amdgpu Pro Driver Linux Mint 19 Setup Guide