Go to Preferences / Display / Colors & Fonts and select Folder Tabs from the drop-down list of items.
Status bar colours are set using hex RGB codes:
<#ff0000>{sd}/{td} folders</#>
That would show the folder count in red.
This is in the PDF manual under Preferences / Display / Status Bar but unfortunately is not mentioned under the Status Bar Control Sequences section at the end so you could be forgiven for missing it. 
You haven't watched my Toolbar Editing Video Tutorial? 
When in Customize mode you simply drag a button slightly away from the one next to it to create a separator. You can also right-click it and select Begin a Group if you prefer.