The transform studio has a lock that, when engaged, keeps the aspect ratio of the transformed object constant when the width or height is adjusted. I always get it wrong, because I always think that the lock is already engaged when it's really not.
This is how I would like it to be (closed/open):
This is how it is now (closed/open):
The lock image I used is from the document settings panel. A lock icon with a simpler style and in grayscale might look nicer in this spot. What's important is that it's clearly visible whether the lock is closed or open.
MajorBreakfast got a reaction from John Rostron in Affinity Designer - Transform Studio Proportional Lock