I’m rockin’ a RX5700 and when I went to the hardware config menu to install it and then reboot, my screen was all neon purple and zoomed in, probably at a lower res than my monitor (1920x1080). For now all I have installed is the video-linux and video-modesetting drivers. I haven’t used Linux in awhile and I’m not that experienced with Arch myself.
You actually don’t need to install video-vesa, better remove it.
Don’t do that either. When you installed the system, the proper driver was installed automatically, aka video-linux.
What was your initial issue that made you take the steps to install everything in MHWD ? 
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