You can’t use meta BindWidget on the widget itself. It has to be INSIDE of the widget to work.
You can assign the progress bar inside of the widget the uproperty meta.
If you want to change the size of the widget on the character then you need to set it’s size in the widget component.

Or through BP

Just put the needed values and not 0,0
So it’s more of a problem of miscommunication of what is needed.
You can either change the progress bar size through the bindwidget meta or control the whole widget itself via set draw size.