HEVC (RPi 3+) Audio Only and No Video

I just installed the latest version OSMC on a Raspberry Pi 3+.
When I try to play MPEG-H Part2/HEVC encoded video only the audio plays and not the video.

Any suggestions on what may be the problem and how to get it working?

High bitrate hevc are highly likely to have issues on rpi as it does not support decoding hevc in hardware. If you need consistent support of hevc files then you should be looking at a device such as the Vero 4k+.

You must activate MMLA and deactivate OMX Player for that feature.

How do I do that?
I looked through all the system settings and din’t find anything like those mentioned.
This is the first time using this so I’m still learning about this thing.