White Text on Red Background when Displaying PDF Files

[default6wqnvgpi4o2n]

I have just installed Acrobat v2021.007.20099 on Windows 10 laptop,.

Whenever I now open an existng  PDF file it displays as bright red backround with white text.

How can I chnage this to "normal" black text on white background? (I am getting aheadache looking at a red screen all the time!)

Many thanks

[Test Screen Name]

Edit > Preferences > General

Accessibility

See if "Change document colors" is on, and turn it off.

[default6wqnvgpi4o2n]

Ah, yes! It was actually set up white on red in Edit - Preferences - Accessibility - Custom Colours.

I have no idea why it had installed like that, but it is now showing as I wish - convention black on white.

Thank you!