The order of views / dashboards is based on the file name on disk.
The file name won't affect the name shown in the nav menu - that is set within the file by your label.
Numerically prefixing each dashboard / view name is the simplest case, and is easy to make a naming convention for using in sub-menus etc also. Eg for a flat life "01_hits_over_time.xml" "02_less_important_hist.xml". For sub-menus something like "apache-01-hits.xml", "apache-02-errors.xml" "os-01-syslog.xml" "os-02-secure.xml" ...
You can't easily rename views/dashboards via Splunk Web [you need to clone, set new name, then delete the old]. Remember when you move, or add/modify, files via the file-system you need to fully refresh the app for the files to get re-read [click the splunk logo top right is the simplest way, or set your location bar to the base of your app eg yoursplunkserver/app/yourapp/]
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