Working with multiple panels open and building layouts is an important feature to keep speed and focus.

You can open multiple panels by either:

Holding in ⌘ or ctrl, and clicking the nodes you want to open.

Standing on an item and hitting ⌘+ m or alt + m to open it in a seperate panel.

Using the mouse, right-click the bullet and choosing Open in new panel.

After the panels are open, you can sort the panels and build a layout by either dragging the panels or moving them with auto buttons in the panel menu at the top of every panel.

Have a meeting? Why not have the meeting notes in one panel and the agenda in another. Writing a blog? Have your notes in one panel and write the blog in the other.