Use

Panes

Two pages side by side, or six.

Splitting

The page area can be split, as in Ghostty or Vim. Each pane shows one tab. The focused pane has a coloured outline, and the sidebar, the keys and the palette act on it.

Keys	Menu shortcut	Action
`<C-w>v`	Cmd+D	split right
`<C-w>s`	Cmd+Shift+D	split down
`<C-w>h` `j` `k` `l`	Cmd+Opt+Arrows	focus the pane to the left, below, above, right
`<C-w>w`		focus the next pane
`<C-w>c`	Cmd+Opt+W	close the pane; the tab stays open
`<C-w>o`		close the other panes

How panes behave

A new pane shows the most recently used tab that is not on screen, or a new tab.
Selecting a tab that is already on screen moves the focus to its pane.
Clicking into a pane focuses it. Dividers can be dragged.
At most 6 panes.
The layout, with divider positions and the focused pane, is saved with the session and restored on start.