The progress bar does indicate how many questions are already answered, and how many are still waiting for an answer:
Moreover, question marks (?) besides each progress bar provide direct access to the unanswered question of a certain type in each questionnaire:
In the questionnaire itself, the right-hand column bears an interactive table displaying the questions breakdown. Each cell can be clicked on to filter out the questionnaire accordingly:
For instance, in the above image, only unanswered questions (be them compliance-related, mandatory or standard ones) will be displayed.