It's easy, and will speed up your report writing even more!
On the Doc Editor page, you'll see an eye icon on the top right. Click the eye to begin editing the visibility of the questions.
In the top-right corner of each question, you'll now see an eye icon that you can click to toggle the visibility of the question off and on.
When you're done, click the top eye icon again to hide your hidden questions and continue editing.
These changes can be made at any time during editing and will be saved for future doc editing as well.