The following screenshots are taken from possibly unreleased versions of
Neovim, to showcase what is possible with a few plugins and lines of configuration: they are not representative of an out of the box experience.
Graphical interfaces are not packaged with Neovim. GUIs are not limited by terminal capabilities and can choose to override the rendering of certain neovim elements (cursor, tabline, popup menu, etc).
This section showcases only a handful of them, see Neovim's wiki
for a list of many of the available GUIs.
Treeview and an externalized popup menu in Neovim Qt
Minimap and externalized window in Goneovim
Externalized command mode in GNvim