DisplayMagician VS Monitorian

DisplayMagician allows you to switch between SLI and separate screens with a hotkey: https://github.com/terrymacdonald/DisplayMagician it's also useful for a lot of other stuff.

If your GPU has enough ports, Display Magician is a great app. thats what i use atm!

Or you can try this tool: https://github.com/terrymacdonald/DisplayMagician

The fix for this is to switch your Windows desktop resolution prior to launching RBR. Take a look at Display Magician or Display Fusion. They are display management utilities that allow you to set up presets, to simplify switching display modes for different games. They were designed to help switch between different multi-monitor setups, but if toggling your Windows resolution manually bothers you, you might give one of these utilities a try.

Most modern displays support DDC/CI or whatever it is that lets your PC talk to the monitor and adjust brightness (and other settings).

Monitorian and other apps let you adjust those settings from your PC.

https://github.com/emoacht/Monitorian

I feel like this is much simpler than many things called out so far, but I haven't found a great replacement coming from Windows for Monitorian. It's a small app that sits in your tray and lets you adjust your monitors' brightness levels. That way you don't have to press physical buttons on your monitors. It's also very nice to be able to lock multiple monitors' brightness levels together so you can change them at the same time.

I don't have a solution but Monitorian might tide you over. Works on external displays too

Monitorian is a nice alternative to the native brightness slider because it also works with external displays.

Releases · emoacht/Monitorian (github.com)

> there's TwinkleTray for Windows

There is also Monitorian for Windows:

https://github.com/emoacht/Monitorian