It would be really useful to be able to collapse certain items.
- You're making an overview for a new project consisting of several parts.
- For each part of the project, I'd like to have an item called "ideas" where the team may attach several sticky notes. These are not yet part of the project. To make order on the board these are collapsed under the "Ideas"-item.
- When we start working on one of these specific ideas we move the sticky note to an "In progress"-item.