Dev channel update to 86.0.622.3 is live

ankitbko That unused space is now just a standard window title bar like most other applications have (the ones that don't have a standard title bar still have one, they just put extra stuff in it like Office does, or for that matter like we do when the tabs aren't in vertical mode).  That's actually much harder to get rid of than you'd think, since as somebody else pointed out, the window control buttons have to go somewhere.  And since title bars are very standard UI pieces in any operating system, it would be a lot of custom work to get rid of it.  You also would need some way to drag the window around, and by that point you're adding more buttons and multiple areas of dead space to the address bar area (only a single dead space won't work if that space is the part of the window that's off screen; Edge Legacy suffered from that problem, and we got TONS of feedback about people who couldn't move their window because the draggable space wasn't visible), making it even more cluttered and hard to use.  And an address bar that's too skinny to see the full website is also a security concern, at least compared to its current design.  I'm not saying we'd never do it, but because of all those things working against us, it would be pretty low on our priority list unless we got overwhelming feedback about it.