Presently in Premiere 25.1 using the new Properties panel you can no longer consistently click on the text asset, then with that asset selected change the font size, font color, etc. This worked as expected in previous versions before the Properties panel.
You now have to highlight the text you want to change.
I was able to get it to work occassionally but not consistently, sometimes it does it, sometimes it doesn't!
However, like in almost every other design application, I should be able to select the layer and make those changes to everything in that layer. It used to work but now it doesn't in 25.1.