Here's how you can change the header color of your mobile app:
Login to your Plobal Apps admin
Click ‘Select App’ on the Dashboard
Go to 'Choose A Theme'
Enter the color in HEX format. Alternatively, choose from the palette that opens when you click on the field
Click ‘Save and Go Live’ on the screen.
Here are the steps to change menu icon's placement :
Login to shopify Dashboard.
Go To Customization.
Go to Choose A Theme.
4. Go to Menu Layout - iOS and select the Bottom Menu.
5. Go to Menu Layout - Android for Android app.
6. Press Save & Go Live.
Here are the steps to change Header Titles -
Go To Customization.
Go To Choose A Theme.
Scroll down & open Feature Label section.
4. You can change text on the header on each screen.
5. Press Save & Go Live.
Here are the steps to change icon's shape and color -
Login to Plobal Dashboard.
Go to customization.
Go to Choose A Theme.
4. Select header color or add a color hex code. Press Save & Go Live.
5. Scroll down & open Menu Icons.
6. Select the icon for 5 tabs which are Home, Categories, My Account, Cart & More respectively.
7. Press Save & Go Live.
Hope this helps :)
If you need further assistance then please create a support ticket here.