Toolbars are a common toolkit control that have been around since the dawn of GUI applications, providing direct access to an application's most frequently used functions. But with increasing scope, the number of frequently used functions grows to an extent that can have a detrimental impact on quickly locating a particular item. LibreOffice made it possible to create UI based toolbars on blank canvas where designers have all the freedom to do whatever they want with the space. The talk will present the reasoning behind the Notebookbar layout with contextual groups.