This isn't how modern browsing should work. Subdomains are separate entities with different UI requirements. Treating them as one service, just because they have the same domain name, ignores how the web actually functions.

Opera needs a smarter layout control system.

Here are my suggestions/what we (the users) need:

• A toggle that can be used to switch between mobile view and desktop view per site and not per domain.
  For example, mail.example.com is not news.example.com.

• Persistent layout memory: Let users lock a site in desktop or mobile mode until they say otherwise.

• Temporal overrides: Sometimes you want desktop view just this once. Opera doesn't have to save it unless the user asks.

• A layout manager UI: A list of saved layout preferences, will help we (the users) to view and edit which sites are locked in which mode.

This upgrade is just about users' control. The Opera Team should give we (the users) the freedom to tailor our browsing experience site-by-site, not be stuck with clunky domain-level assumptions.

Opera’s always been the browser that dares to do things differently. This is another time to push that boundary again.