Remove the need for Medium Power Saving mode to be turned off to use 120hz, this is a useless option and will make battery life worse.
I have rooted samsung phones for years and had always forced 120hz with Power saver on ever since I started using the s20 5G 2 years ago when it first released and I still manage 12+ hours screen on time, sometimes more.
However with 120hz on and power saving mode off I am barely getting anymore than 4-6 hours.
I now own the S20 Ultra and can manage at least 15+ hours SoT with 120hz & power saver on.