[a]

Hi,
on BsPlayer 1.21 I found a work around to this problem.
I did not tested on other versions.

It seems that the properties "subtitle width margin" and "subtitle height margin" were inverted.

In order to increase the subtitle width margin I increase the
"subtitle height margin".

It seems that when I switch to Fullscreen mode and then to TV the display,
the subtitle witdth margin property is not always taken into account.
To solve this problem, while on the TV Display, I switch to the window mode, and then I switch back to the full screen mode. In summary simply hit two times F if you encounter this problem.

I hope this help.

Regards,
Arnaud