Modify the default SolarWinds Disk Warning rule in LEM???

I have a federal STIG requirement to monitor for when the SIEM reaches 75% of disk space used.  The default rule out of the box called "SolarWinds Disk Warning" uses 90% used as the trigger for the warning.  The problem I'm having is in the rule I don't see any 90% listed anywhere in the logic.  How does this rules work?

The correlation says:

InternalWarning.Detail != *-16Z*

InternalWarning.EventInfo != *101%*

InternalWarning.EventInfo = Manager Monitor Warning*

InternalWarning.EventInfo = *Disk*

I'm not sure I understand how this warns on disk over 90%

Am I missing something here???  Still new to LEM and getting this figured out.