Currently there’s no way to hide the top bar, which would be nice for people that:
- Have an OLED display and want to minimise the risks of burn-in. OLED displays are not a novelty anymore, they’re becoming more affordable and we’re starting to see them even in budget-friendly laptops
- Want as much display as possible to manage applications
While other desktop environments (or the Windows UI) offer an “auto-hide” option for their bar / taskbar, I don’t particularly like these implementations as they may be not responsive and glitch out from time to time… Plus, there’s always the possibility of accidentally triggering the bar to pop up even when it wasn’t needed by just moving the mouse.
IMO GNOME could implement this functionality in the best way possible: have it visible only in the Activities Overview view by pressing the Super key or by moving the mouse to the Hot Corner (if not disabled by the user).