You can delete the code {{navigation}} and put your custom menu code there.
If you want to change the pulse generated menu code, open the file ‘navigation.phtml’ from the folder ‘pulsecore > template > tags’ and change whatever code you need to change.
Thank you for the excellent and rapid response!
This is the code I was looking for.
Here I am can adjust various other Tags.
Can you add a navigation tag extension to your administrator?
We’ve added the css_classes parameter to the navigation and navigation-logged-in tags.
For the navigation tag its something like {{navigation:"all":"css classes"}}
The first parameter is the label parameter which is used to select a menu. The default is “all”.
For navigation-logged-in, label and css_classes are probably interchangeable. I suspect it might be better to keep them separate in case its needed later.
For other situations (majority of users) just {{navigation}} will still work
Changing/adding classes is mainly if people want to add things to the navigation like with Bootstrap 4 etc as listed in this thread.