How do I remove Siri from the collapsed Control Strip?
I called Apple multiple times about this, each time it was escalated to a Senior Advisor, and each time nobody could figure this out. While toying around with it, however, I found the solution:



The only combination of preferences which allows you to customize the collapsed Control Strip is:


Touch Bar shows App Controls
Show Control Strip is checked


Then when you press "Customize Touch Bar...", you will be allowed to customize only the collapsed Control Strip. After you're done with that, you can change your "Touch Bar shows" preference to whatever you want: