Changes in PNL calculate?

Hi ,
Until some days ago , SIZE information at UI - Positions screen , was expressed in BASE ASSET( BTC, ETH, etc.)
Now SIZE is expressed in USDT!
1- How obtain this SIZE in USDT ?
2- How calculate PNL if I don’t know the QUANTITY SIZE of base asset bought ?
4- WHY changes ?

Help !!

even though this is a UI question, which requires Customer Support attention and not in this forum, I might know the reason.
On the UI, there’s a place for you to choose which asset you want the “size” to be shown.
Screenshot 2022-09-20 at 17.32.42
The image already gives BTC, but that’s the section you click to select the base asset instead of having it with USDT.

If you need further help, please reach out to the customer support.

Tks very much !