Mobile App: Long Press Expand/Collapse Icon to Expand/Collapse all sub-nodes

Currently there is no level control for the mobile app. If you want to work your way down the tree to the topic you are looking for, you first have to manually collapse every node, from the deepest levels up to the top. Then when you are done, to make things easier on yourself next time, re-collapse everything on your way out.

This is nonsense.

Suggestion/Request: Long-press the expand/collapse icon to the right of the node to expand/collapse itself and all it’s sub-nodes. If the node is expanded, collapse everything: if it is collapsed, expand everything. This should be fairly intuitive and does not require any more screen elements or extra icons.