The default 2-column view shows both the list pane and content pane.
There is an alternative 1-column view where the list and content panes are merged into a single combined pane which displays either an individual item or the list of items matching the current filter.
This view is useful in several situations:
Use the control at the top right of the toolbar to switch to 1-column view.
This is an individual item shown in 1-column view:
To view the list of items, click the icon at the top left of the combined pane.
Clicking an item from this list opens it in a new tab and focuses it (or just focuses it, if it’s already open).
If you want to open items as separate tabs without focusing them, hold down Shift and click on them. (This is not currently supported for all types of content.)
The control to the right of the icon displays the items in the list as a pull-down - you can use this even when you have an individual item displayed in the combined pane.
To open an individual item from the list (replacing the current focused item), click its title.
To open an individual item from the list in a new tab, click the icon (or hold down Shift and click on it).
Items that are already open are shown in gray on the list. Clicking them focuses their tab.