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Inside the <Drawer.Screen that you want to hide the header title, make the headerTitle inside options to have the value of an empty string:
<Drawer.Screen name ="MyBottomTabs" component ={MyTabs} options={{ headerTitle:'' }} />
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Inside the drawer screen that you wish to hide the title for, set the headerTitle to an empty string, like this:
<Drawer.Screen name ="MyBottomTabs" component ={MyTabs} options={{ headerTitle:'' }} />