Can't see 'line focus' option

Hi all,

I find the fade of the background in Edge frustrating as it dims the images and wanted to remove the fade (or make the images remain in focus).

I thought maybe the 'line focus' option would help, but I can't find it in my browser.

I click 'reading mode (F9)', but see no option for 'reading preferences' in the top bar - instead I see what I've attached.

I'm using Version 150.0.4078.48 (Official build) (64-bit).

Can anyone please help?