Subtitle Location

Hello,
I have searched the FAQ’s for months trying to find out how to set subtitle location to the bottom of my screen rather than the bottom of the video picture but can find nothing. It seems to me that the Plex attitude is that if you HAVE subtitles you should be happy and don’t ask for more settings like location. I am using Plex server for WD NAS v3.41.2 and Android Player v6.16.0.4271. When I read articles on how to set subtitle location, the settings I read about don’t exist on either my server or my player. I want to have my subtitles shown at the bottom of my screen whether it’s an srt file or part of an mkv file rather than the bottom of the video image. Why is this so hard to figure out, other apps make it easy, where are these settings???