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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 20.0.5
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.x
Apache or nginx version (eg, Apache 2.4.25): NGINX
PHP version (eg, 7.4): 7.4
The issue you are facing:
I’ve noticed on more recent versions of Files app, the left hand menu is not able to be hidden, which makes this unusable from most mobile browsers. On older versions of NC, this menu could be minimized using a left swipe gesture, or by clicking on the = burger menu icon that floated at the right side of the (mobile) browser screen.
I use the mobile apps, but some users need web access as well!
Thanks!!!