In V2.729 and earlier in Contemporary UI, the search field (which is otherwise shown at the top right) cannot be seen if the resolution becomes smaller (for example on a mobile device).
In this case, the search field can only be viewed on the desktop in the large browser, but not on the handy. Not good - please fix it.
The error can also be tested on the PC. If you make the browser window smaller, the search field disappears at some point.