It sounds like your video editor is defaulting to the integrated Vega 8 GPU instead of your dedicated RX 560X. This can happen due to settings within the video editing software or your system's graphics settings. Here are a few steps you can take to resolve this:
Set GPU Preferences: Go to your system's graphics settings (usually under 'Display Settings' > 'Graphics Settings'), and set your video editor to use the RX 560X as the preferred GPU.
Check Software Settings: Some video editing programs allow you to manually select the GPU in the settings or preferences menu. Make sure your RX 560X is selected there.
Update Drivers: Ensure that both your integrated and dedicated GPU drivers are up to date. Sometimes, outdated drivers can cause such issues.
Power Settings: Ensure your laptop or PC is set to high-performance mode in the power settings. Sometimes, balanced or power-saving modes might prioritize the integrated GPU to save power.
If these steps don’t resolve the issue, you might want to check the specific forums or support for your video editor for additional guidance.