AMD just doesn’t have any official gui setting software on Linux
third party tools like CoreCtrl will help you with some settings like overclocking, undervolting, etc. and for basic settings your desktop environment of choice already give you control over resolution/framerate/gamma/whatever
for an ingame overlay and fps limiting take a look at mangohud
there is also a lot of confusion because there are different software names for kernel driver (i.e. amdgpu) and userspace driver (i.e. Mesa) with additional varieties on top like vulkan-radeon and amdvlk (which is included in amdgpu-pro and typically worse)
luckily most people don’t really need to care about that since most linux distro already give you the best gaming choice out of the box and updating your system will also update your amd driver