Cant change stroke Brush Size via Composition, only via top bar. AECS6 I am trying to do this tutorial:

                
            

When I try to change the Brush Size of the Stroke via the left panel (the guy in the video does it at 2:04 - 2:09) it does not cover the text (PIC 1), it only covers the text when I use the "Stroke Width" in the Upper Bar (PIC 2).
Am I missing something?

https://imgur.com/a/PwPGd (PIC 1 and 2)
I am using Adobe After Effects CS6
That happens because in the video path is added to the Text layer, but you have it on separate shape layer.

Try to move you path to the text layer.