Interface text size/accessibility

Is there any way to increase the size of the font in the Channels interface on FireTV? I'm trying to set my mother up with Channels but it is hard for her to read the guide from across the room.

Any accessibility feature with higher contrast? ex. Black background with white text instead of purple?

is the streaming box set to 4k? maybe just switch to 720p?

The developers in the past have stated that they dislike the idea of supporting multiple color themes.