Photoshop V 22.1 - constrain proportions while transforming has changed again....help

A few years ago this changed so that when re-sizing a shape you no longer needed to hold down the shift key (on a Mac). It was a bit frustrating at first but I got used to it and now I very much prefer it this way, with constrain proportions being the default.

Suddenly (not sure if it was the update) this has reverted and I am needing to hold shift again even though I am on the latest version. How can I fix, change revert this? It is driving me mad and does not seem to have happened to colleagues.

I checked preferenced and the "Use Legacy Free Transform" box is not checked.

Can anyone advise me?