@leocg Fixed! Thanks!:3

@leocg I've done so and will see if they help tomorrow, thanks. Will update later.

@pacheco0424 What version of Opera? Did you check with extensions disabled?

@ryvamon Are you using any extension? It looks completely different here.

For those that find this when searching for themselves

Go to the easy setup button on the top right of the browser.

Scroll down to RGX

untick the boxes saying Split preview for video and image enhance and the yellow line will disappear.

If you look at the pictures or videos, the yellow line starts in the middle, the left is when the browser uses RGX to enhance the image or video and the right is when it is not enhanced. So you can choose which looks best for yourself and enable or disable RGX or use the slider to increase and decrease its affect according to your personal preference.