Disclaimer: Not suggesting this is the best/correct/greatest approach but it works* for me for now.
Like others on here a bit frustrated with having two different URLs for your site (mobile & desktop) a hopefully temporary solution till Glide offers an official solution I have created a redirect script that depending on user-agent or screen size or feature detection will redirect user to either mobile or desktop (full) view.
For example if user clicks or navigates to myglideapp.com with a screen size less than 700px then redirect user to app.myglideapp.com (mobile version) else redirect user to app.myglideapp.com/full (desktop).
Pretty simple to setup. My script with base domain is hosted on Firebase which has a very generous free tier.
Hope this helps.