So far, you’ve been opening any first-level entry in the navigation by hovering over it. You may close it by clicking somewhere outside the menu only. This has been rather frustrating for many users because the menu may open unintentionally by hovering over it. If that happens, you need to click somewhere outside the navigation bar to close it.
What we fixed now is exactly this behavior so it is consistent with Jira and Confluence menus. You open the first-level entry only by clicking on the arrow and you can close it by clicking again on the arrow beside each tab or outside the menu.
When you have clicked on the arrow of a top-level entry and you have opened it, you can access the other tabs just by hovering over them.