[tryp4vps]

..... the only problem is that mobile default to mybb gomobile theme so i need to manually go to bottom of page and press switch to desktop site to use the responsive theme . and i always do that because i didnt like the gomobile . suggestion from me is just to disable the gomobile and force the mobile user to use the responsive one .

Google now implements mobile-first, so it is better to keep mobile theme for better SEO.

You could disable the option "Use a mobile version if I visit from a mobile device" on your own if you really do not like it.