There are a few ways to expand/collapse your bulleted content. Please note, there have been changes in the latest design as of 2018, so some older methods are not available.
1. Expand/Collapse all - From the Home screen's main menu, ‘Expand All’ and ‘Collapse All’ are options you can select.
2. Expand/Collape all under one parent item - ‘Expand All’ and ‘Collapse All’ options to the menu that appears when you hover over a bullet, or from the menu at the top right when zoomed to any bullet.