In smartphone-sized screens, close the main app menu when clicking on the sidebar toggle button.
In smartphone-sized screens, collapse the app menu when selecting a feed or folder for reading.
In smartphone-sized screens, close the collapsible app menu when going to the start page.
In smartphone screens, when clicking on any menu entry, clicking on a feed or folder, opening/closing an entry, or clicking on the feed title inside an entry or in its "mars as read/unread" button, the main application menu collapses.