In all our experiences 4.1 works fine with IE11, also when executed via IIS Express. IE11 should just run "normally" using Edge.
Is this a clean 4.1 installation or has the Composite C1 install been upgraded from an earlier version? If you dig deeper with the F12 tool, do you see any 404's or script errors?
Is this a clean 4.1 installation or has the Composite C1 install been upgraded from an earlier version? If you dig deeper with the F12 tool, do you see any 404's or script errors?