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I'm using pretty much the standard i3 config and sometimes I press the wrong keys and this extra bar shows up at the top:
I believe it's the "parent container"? How do I hide the bar again? It disappears if I close all windows on that workspace, but reappears once I open a window again. I'd like to find a solution that doesn't require restarting i3.
This looks to me like you've switched to a stacking layout. For example, I have this in my config file:
bindsym $mod+s layout stacking
bindsym $mod+w layout tabbed
bindsym $mod+e layout toggle split
The default is usually split. Perhaps you pressed $mod+s to switch to stacking. Try $mod+e to switch back.
See section 6.3 of the i3 docs: https://i3wm.org/docs/userguide.html#manipulating_layout
S[ just changes to T[ or V[. But that bar just stays there.