PSUnreal Client logs and configs
Windows
Logs are located in %localappdata%\PSUnreal\Saved\Logs
Configs are located in %localappdata%\PSUnreal\Saved\Config\WindowsClient
Just copy the string above to your windows explorer address bar and %localappdata% will become a real path.
Linux
Logs are located in ~/.config/Epic/PSUnreal/Saved/Logs
Mac
???
Overriding a config
Override the scalability setting, you need to edit PSUnreal\Saved\Config\WindowsClient\Scalability.ini and add:
[PostProcessQuality@0] r.RenderTargetPoolMin=100
then in the game setting panel you should use the "Low" for post-processing setting, which corresponds to "0"
Low = 0, Medium = 1, High = 2, Epic = 3