P: Doesn't constrain proportions when resizing from side handle while holding Shift key

If you're talking about shapes you made with the rectangle tool, it's apparently the opposite of the picture-resizing system. Go to your shape layer, hit "command-T," and just grab any handle to resize the width or height. If you hold down the shift key, the proportions will be constrained. 

Yes but how do I increase the height of a shape later on? I've tried unlocking the proportions but it doesn't unlock. Argghhh!

I'm still trying to figure out how to be able to increase the width of my squares while the height stays the same. Even if I turn off the lock the proportions stay locked. I'm going crazy. All I can think of doing is to created a whole new shape. I'm so confused.HELP!

This is what happens when Adobe is marketed to the masses vs professionals. I have spent 25 years using this software and the muscle memory is hard coded. Spent years fighting against untrained clients distorting images. Anybody remember when Adobe CC came out and they touted  that the whole suite would operate with the same controls...

OMG please revert back to the old way. I hate this new feature. 

Winter--see Alejandro E's post below. It explains all. 

Yeah, I couldn't find it either. I searched and searched the official Photoshop forum, and nothing came up (except for Illustrator!). I never heard of this "Photoshop Family" place before just now. 

Thanks! It took an hour to find the correct answer!

I've thought the same thing about many of the features between these two products. It's silly updates like this that will push users to new products like figma and Sketch.

This feature was a total, utter waste of time.