Are you sure you have the Radeon drivers installed?
The display in-game implies the basic Microsoft display drivers are the only one's installed.
Task manager is only listing the name of the processor itself, which is 'AMD Ryzen 5 5600G with Radeon Graphics'. It's not showing the iGPU at all which further implies you likely don't have AMD's graphics drivers installed, if you had them installed it should show AMD Radeon Graphics on the left side.
What does it show up as in Device Manager under Display Adapters?
The drivers for the iGPU are
here.
I presume you are using the integrated GPU on the processor, or do you have a discrete graphics card installed?