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Hi Arjun,When you create a new App that time you should have ticked the "Overwrite Users' Personal Custom App Customizations" checkbox.For more information follow below link it may helpful for youhttps://salesforce.stackexchange.com/questions/143671/why-adding-a-tab-is-not-displaying-in-my-lightning-appI hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.Thanks and Regards,Ajay Dubediwww.ajaydubedi.com