When I start MS build-in Event Viewer, then go to Custom Views--->Adminstrative Events and right click and select "Properties" then all the parameters are disabled resp. read-only.
See attached snapshot
Why?
As far as I remember they were editable in the past. I could (de-)select e.g...
administrative events
configuration
customviews
editable
error messages
event viewer
logs
microsoft
permissions
properties
read-only
system administration
system events
technical support
troubleshooting
user interface
wevtutil
windows settings
windows tools