Customize Edge for vision impaired?

Hi,

I'm testing Windows 10 for my parents, both of whom are vision impaired - still have them on XP with IE 8 and running into many issues with different sites but it's hard for them to adapt to something new at this stage and the white backgrounds, that are default for most things, including Edge, can't be used by either of them.

Edge seems VERY limited in how it can be customized - there doesn't seem to be a way to change even the colors, is that correct? For instance in all versions of IE you can change the background, text, viewed and unviewed links, and hover colors - can this be done in Edge?

And, if not, how can I hide/remove Edge and use the version of IE that comes with Windows 10?

Thank you for any suggestions you might have!
Rob

There is a dark theme for Edge. Click the menu button (ellipsis), click Settings, and select "Dark" under "Choose a theme".