Fairly often, I’m working outside with a Nomad setup and the sun is making the dark Eos color scheme impossible to see.  The answer for me is to invert the colors of your operating system, preferably with a shortcut.

On a Mac, enable the shortcut in System>Keyboard>Shortcuts>Accessibility.  

Once enabled, press Control, Option, Command, 8 all at once.  Viola!  White is black and black  is white.

On Windows, go to Settings>Accessibility>Color Filters.  Ensure you have chosen Inverted.

Now, scroll down and enable the shortcut by clicking it. 

Now press Windows+Ctrl+C and again- inverted colors whenever you need them.