I have the exact same issue. its not so much a problem with my eyes being sensitive to the color itself its more so just annoying to see it always there when streaming or capturing for editing later. I have a twitch chat app called Ghost Chat that I keep on my main display while streaming so I don't have to constantly look at another display to see the chat itself and it creates a floating transparent window I can turn on and off anytime I want. but when capturing whatever it is I'm playing or doing on my PC the chat window has a yellow border around it. I understand MS wanting to make sure there are security measures in place but there should be options to change the way it LOOKS at least. maybe have a registry editor option that lets us manually pick the hex-code color or even a transparency slider for it. its not too much to ask for this and it seems like they don't care because they'd rather be lazy and have a single solution to all problems related to this subject rather than giving us the option to choose how we use this feature. its a major problem to those who want to turn their streaming time into a career when these small things all add up to larger problems down the line.
and to those saying "well just go to this other website to find help" or "use this option here to fix the problem" you don't think we've already gone everywhere else? If you're capturing a single window, not the display itself, the OBS capture methods change. you can't select DXGI for window capture or in my case Game Capture. its not a choice I have. And I like capturing the game rather than the display because A: audio isn't captured properly through the display capture option, B: if i have other software running in the background, a browser, a media controller, something i'd need to alt tab to every so often I don't want the stream to see everything. they aren't there to see that stuff they're there to see whatever game I'm playing.