To set the verbosity of a logging category on startup for your whole team, add a new line in your DefaultEngine.ini (located in YourProject/Config) and write [Core.Log], then for any change you want to do simply add a new line under [Core.Log], and write <UPCategory>=<Verbosity>. For example LogUPRuntimePrefabSubsystem=Verbose
To change the verbosity of a logging category for the duration of your session enter Log <UPCategory> <Verbosity> in the console. For example Log LogUPRuntimePrefabSubsystem Verbose.