I noticed this on Node-red 5 Beta 5 but it's the same on 4.1.8.
Firefox browser on Linux.
The Dashboard 2 sidebar has 3 tabs, "Layout", "Theming", and "Client data". Perhaps there are others in some circumstances.
The ui pages and groups section of the sidebar is set to the full visible width of the sidebar.
If you drag to reduce the width of the sidebar you can move "Client data" out of sight.
The ui page/group summary eg "2 Groups" is allowed to slide under the buttons, and eventually the page or group name is shortened with ellipsis (ellipses?)
A scrollbar is now shown at the bottom of the sidebar, but it seems useless.
Dragging it's handle to the right reveals only empty space, neither the third tab nor the hidden parts of the pages & groups are available.
Also the heading "DASHBOARD 2.0" slightly overlays "This is my ui-base" and the two slim buttons at the top. (See 1st pic).
I think this bit is confined to Node-red v5 beta sidebars.
