For Android open android folder in android studio.
Open the AndroidManifest.xml file and change the label name.
By default, you will find the labeled name is “FoodZone”.
Replaced with your project name.
For IOS go to the your ios folder where you save in your system.
Open .xcworkspace file on the latest Xcode.
Go to the main target general settings.
Change the application name from the app name
Change the application from the info.plist file.
Clean the project using cmd+k or cmd+shift+k.
Build your project and run it on your latest iPhone.