Well, if you are anything like me, you are still looking for that new control/feature.
When you open the mat screen to make a mat, there's an unobtrusive button that has been added to that screen.
It sounds like it's a small improvement, but for me it's big!
If I enter the thickness number for my mat in the bottom box, (let's say, 0.20), I tick that new button and that size is now in all 4 sides.

For a person like me, huge. I am not the greatest mouse operator, add aging eyes, and it takes me three tries per side box to get them all the same and have the decimal point in the right place too.
See screen snap with white mouse pointer showing the new button.

Have fun
Fred