On my server (https://www.leonardis.info/gt) I downloaded and deployed , the metronic 8 theme number 23. The ploblem is that the responsivity doesn't work,'
PS. I test with two type of smartphone ... and doesn't work!!
Never remove from your theme the follow html tag: ' meta name="viewport" content="width=device-width, initial-scale=1"
Glad to sorted it out. Yes, those are important meta tags for responsive mode.
All the best with your projects