There are several ways you can develop applications for multiple mobile form factors with XE4:
• Use Alignment and Anchors
>> This is demonstrated through our iOS FireMonkeyMobile samples, code snippets and mobile project templates.
• Leverage the Form Family Property
>> A detailed tutorial on leveraging the form family property in your mobile apps can be found here.
• Use a separate form for each orientation
>> A sample demonstrating using separate forms for each orientation can be found here.
Regards,
Sarina