How do I delete the WindowsUpdate.log from within the PatchManager
You don't. The WindowsUpdate.log is the logfile of the Windows Update Agent and exists on every system. The logfile has a max size of 2 megabytes, and the WUA automatically purges the oldest records to maintain the logfile under that size.
Is there a way to save this config or is deleting the log the one-and-only?
The View State of the Computer Explorer can be saved with Save View Layout, just like any other datagrid in Patch Manager.
Thanks - Tomatoes and eyes ... I must have been blind.