Android Authority: Edge Sense Plus makes the HTC U11 a shortcut machine
XDA-Developers: Edge Sense Plus for HTC U11 Quick Look: Get More Out of Every Squeeze
What is Edge Sense Plus?
You should already be familiar what Edge Sense is. By squeezing your device, it lets you perform some minor actions.
Edge Sense Plus extends those actions and adds some more features for you.
How does Edge Sense Plus work?
It is a simple app you install from playstore, linked at the bottom.
To get it working, you enable Advanced Mode'in the native Edge Sense Settings and select "Launch App" as custom action for both short and long squeeze
and pick the appropriate Edge Sense Plus Activity.
When the app starts the first time you'll get those instructions step by step again.