Thank you for responding.
No, the monitor does not switch to 23.9Hz after launching Dolphin in portable mode.
I realize now, the refresh rate only gets forced to 23.9Hz when using the Vulkan backend. (I set Vulkan because I have AMD graphics)
Direct3D works just fine, so I'll use that. Unless there is a known workaround to get Vulkan working.
EDIT: Actually, I think this is caused by enabling GPU Partitioning in Hyper-V on this PC.
No, the monitor does not switch to 23.9Hz after launching Dolphin in portable mode.
I realize now, the refresh rate only gets forced to 23.9Hz when using the Vulkan backend. (I set Vulkan because I have AMD graphics)
Direct3D works just fine, so I'll use that. Unless there is a known workaround to get Vulkan working.
EDIT: Actually, I think this is caused by enabling GPU Partitioning in Hyper-V on this PC.