Let's revisit the responsive layout for doc.qt.io, and optimize for also smaller screen width:

Empty space

When resizing the window, there are cases where the main column is already reduced to make place for a right side column, but that one isn't shown yet:

Burger Menu

When the right menu isn't shown, there is no way to navigate within the page anymore. We could provide a burger menu, like https://docs.flutter.dev/ does: