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i wanted to add new tab in kibana? can anyone tell me please..

our team wants to add new angular page in kibana

Applications register themselves in the side navigation with uiExports.app. For example, the maps application registers itself like this https://github.com/elastic/kibana/blob/7.5/x-pack/legacy/plugins/maps/index.js#L32.

You can follow our plugin development guide for more details.