Hiya,
Sorry to start the chat with a bug report but I just came across this one and I think it would be useful.
When using multiple collision capsules which have been duplicated, changing the size of one changes the size of all of them as displayed in the designer window. However, the actual parameters only change on the one that you are modifying. I assume that the correct behaviour is for the only the one capsule to resize.
This happened in https://playcanvas.com/kimonsatan/gui