Hi Siggi,
Thanks for using Syncfusion Products.
We are glad to know that you have met your requirement, please refer the below UG Link for more details about the header customization.
#1 Header Cropped Initially
Could you please provide the tested device configuration details such as,
1. Android Device model.
2. Android OS version.
It will be helpful analyze on this issue and provide you a possible solution.
Regards,
Sivakumar P.