how to customize egret theme in angular.js

I have installed Node.js and Angular.cli on my local server. I have also integrated the egret theme in this environment. Now I need to customize the sidebar menu for this theme. I want to remove some items from the sidebar. The sidebar items are displaying dynamically. I tried to make changes in my "navigation.template" file but it does not work well. I could not get the file from where its being displayed. Can anybody tell me how I can get the sidebar items and remove some items.

Thanks