What are all the PRO features in the Hierarchical Filter?

In a Power BI report the Hierarchical Filter visual has an orange lock, which renders a pop-up (when hovering over) reading ‘You are using one or more PRO features’. However, as far as I can see, in the Filter Panel there are just two features marked as PRO (‘Enable search’ in ‘Filter options’ and ‘Number formatting’; version 1.1.0), which I have disabled already.

What am I missing??

Thanks, Bastiaan