Refresh Rate Max Forced
This bug has been around for a long time and still isn't fixed, in full-screen mode League forces you to use the highest available refresh rate. With the new client this is completely ridiculous, you need to add the ability to select refresh rate in your options/config file. I use 120hz because ULMB is better for gaming than 144/165hz and I strongly prefer no motion blur. I fixed this somehow on my old system (I believe through using a custom resolution tool) but I can't seem to get it to work now that I'm on windows 10 with my new PC.
Please don't ignore this bug, it's been reported a bunch of times and I have been completely unable to find anyone with a real answer that isn't "play in windowed or borderless". I don't want to play in those modes, fullscreen is better.