Hi,

To adjust the PostProcessVolume, you can utilize the "Set Members in PostProcessSettings" node and Get Aximmetry ... nodes in your blueprint. For instance, if you're looking to alter the Reflection method, you can follow this example:

The entire blueprint logic above can be copied from here: https://blueprintue.com/blueprint/hvyk4n0p/

Note that the "Set Members in PostProcessSettings" node can modify several settings simultaneously.
For settings that are enums, like the Reflection method, you'll need to construct the array for the enum using the "Get (a ref)" and "Make Array" blueprint nodes.

Warmest regards,