Article settings now allows the users to switch between dark and light modes, with clear differences for the links to be visible. With regards to dark / light mode in the portal that is a different feature request to be addressed. So we are closing this bug.

Agree. When the dark theme is selected, the theme should customize the content so that any dark text on a light background automatically switches to make it easy to read.

Hi Lars, We are planning to bring the link color option as well on the appearance settings.