I’m trying to build a half modal using react navigation. however when is croll down i see a weird dim background oapcity. Is there any way to get rid of this?

<AppStackNavigator.Group
            screenOptions={{
              presentation: 'modal',
              contentStyle: {borderRadius: 50, marginTop: 200},
              headerShown: false,
            }}>
            <AppStackNavigator.Screen
              name={APP_MODAL.setType}
              component={SetTypeModal}
              options={{
                headerShown: false,
                contentStyle: {
                  borderTopLeftRadius: 50,
                  borderTopRightRadius: 50,
                  marginTop: 200,
                  backgroundColor: 'orange',
                },
              }}
            />
          </AppStackNavigator.Group>
    ```