How tot reset external player settings

Because of a wrong subtitle setting i need to reset external player settings.
Only first setting is remembered.
Or where is it stored?

 

should be under android apps, wipe data.

 

No, external player is not under apps.
Settings, like font size and color are stored somewere.
Only first settings are remembered.
But i dont want to change Fontsize for all movies seperately.
Reset tot factory settings will do the job,but is alot of extra work.