Subtitles Premier Pro CC2017

Hello,

I have centered my subtitles at the bottom of the image with CEA 708 and in clear.

I installed the new Premiere Pro CC 2017 update.

Now all my subtitles are no longer centered and are either top left or centered or bottom?

How to place all subtitles, centered at the bottom, automatically, as before the update?

Thank you for answering me .