When the left sidebar is hidden, there is no direct way to get a node(s) in the workspace, other than the ctrl+click.
Would it be an idea (useful for small screens) to add a small icon when the sidebar is hidden and when clicked, it shows the same "node menu" as with ctrl+click?
To elaborate a bit more, when sidebar is hidden, show a small menu-like icon, when clicked, show the "add a node menu". Not sure what the technical implications of such a request would be (location placement of the node).