To help you get an idea on what you can use iCUE to see and control in your i-series power supply unit, this article has some visual aids and explanations to help you get started.
The dropdown menu under Fan is where you can apply custom cooling configurations.
The Default option menu will match the graph in the user's manual. This setting saves to the PSU automatically like a hardware profile; it does not require iCUE to be running to use the custom curves.
This is the default appearance without any alerts being set on the CPU.
This is how the screen appears once an alarm is set. Multiple options can be used on one Alert profile.
Like cooling settings, alerts are saved automatically and immediately to the PSU once selected from the dropdown menu. They can only be based off the temperature value of the PSU and not any other temperature value, such as CPU or GPU.
The options for alerts are:
Single rail OCP differs from multi-rail OCP in that all power to the PSU can be provided from a single source, while multi-rail PSUs split the power into two or more rails. This means single rail is ideal for higher performance PCs since customers do not need to worry about load balancing the rails (where you plug in the cables into the PSU).
Please note that, assuming all other things being equal, there is no difference between single rail and multi-rail when it comes to safety. If you need more information regarding this, please see this link.