Navigation change made in splunk weg is not saved in default.xml under nav directory
Just to throw it out there, lets assume you're looking at APP_NAME/default/data/nav/default.xml
It could also be saved in APP_NAME/local/data/nav/default.xml
Alternatively it could also have made it to $SPLUNK_HOME/etc/users/USERNAME/APP_NAME/local/data/nav
But seriously, like Ayn says, you need to make sure that whatever you post is readable, has detail and actually has a question!
Do you have a question? If so, please describe, in detail, what you're trying to do, what your problem is, DETAILS on this problem, and finally what help you want from this community.