wow thats annoyingly stupid :(
too bad for me then

My windows 10 is up to date..

Use Relive or Shadowplay (depending on your graphics card) those are the best softwares you can possibly use since they are optimized to your hardware.

I'm trying to costumize reading mode to fit better for my eyes but even though I updated windows 10 to the latest version (and hopefully it updated edge as well?) I still only have 3 themes (instead...