Where is the new "•Command for "Mono" in mixer main out " shown on the recent update list

The recent update list:

Version 3.5.2 Release Notes (September 26, 2017):

New features and improvements:

• Arranger Track in Studio One Prime/Artist
• Support for StudioLive Series III rack mixers
• Support for StudioLive AR22 mixer
• Command for "Mono" in mixer main out <<<<<<<<<< Where is this?

• Click on automation track control opens the plug-in
• Bounce keeps bus routing
• Option to disable mixer undo
• Updated Song Information window design

• Blacklist for incompatible VST3 plug-ins
• Delete device slots by drag & drop (with cmd modifier)
• Higher resolution for zoom commands option
• Improved Quick Zoom behavior
• Favorites list in browser sorted alphabetically

• [Project Page] Events snap to other events when moved or resized
• [Project Page] Digital Release renders individual tracks based on track markers
• [Developers] API for cloned plug-in instances in low-latency mode