If you are an Amazon Prime Video Customer and want to customize how subtitles appear on your Devices, then simply follow below steps.

Customise Amazon Prime Video Subtitles

Login to your Amazon Account or PrimeVideo.com

Click on Account & Settings

Choose Subtitles Section

and Customise how subtitles to appear on all your Amazon Prime Video registered devices.

or click this direct link to Customize Subtitles on your Prime Video https://www.primevideo.com/settings/subtitles/ref=atv_set_subtitles

Prime Subtitles Customization

You can Preset or Choose/Change Below Customization on Prime Video.

Color – 8 Colors Can be Chosen

Font Size – 5 Different font Sizes

Font Style – 7 Different Font Styles

Edge –

Opacity – 50%, 75%, 100%