The stack view is now positioned correctly, but the buttons are shorter than the stack view. In the Document Outline , Control-Drag from the Start button to the Stack View and select Equal Heights . Do the same for the other two buttons.
I’m using XCode 11.4.1 and this did not seem to work as expected. After I added the “Equal Heights” constraints the button heights were set to a multiplier of 0.5333. I double-clicked the constraints in the visual editor and edited to multiplier to 1 which seems to be what was expected. Not sure if I did something wrong?
A multiplier of 1 is correct and what I would have expected. I assume that Xcode 11 set the multiplier to reflect the current difference in sizes where earlier versions would change the button size.