When there is no article on "In progress" tab in CX's dashboard, default tab (when coming directly to Special:ContentTranslation or from usual entry points) should be "Suggestions". It should inspire editors to pick some article and translate it. If there is at least one article on "In progress" tab, should be showed this to finish and publish it.
As an initial step, we make sure that suggestions are shown the first time ever the user accesses the dashboard. That will improve the first-time experience and was much easier to detect.