When I add new constraints in storyboard, Align Trailing to: Superview is added. But what I want is Trailing Space to: Superview. What am I doing wrong?
Can't add space constraints in xcode 13.2.1
You can edit the constraint in Interface Builder (size inspector) and replace the value of its constant (probably 0 or default) by the value you want.
You coud also create the constraint directly in Interface Builder by control-dragging from the object to its superview toward the right (not using ˋadd new constraints`) and add trailing constraint from the popover.