> If you make the drawer to small, it'll disappear (like in all apps > where you can resize the drawer). To bring it back, open a tab (or > close a tab) or call :set showtabline=1 or :set showtabline=2. If you > want it hidden, call :set showtabline=0, just as before.
Also, if the drawer closes by making its width too small (as expected), it will become visible again if you switch to a different tab via the various tab switching commands such as :tabnext, :tabprevious and others. Thanks, Michael