Need to do full screen while calling app

[remorex]

When some on calling his picture want to came full screen anybody know how to do that pls tell me the setting

[Maackman]

You want calling person's picture to be shown in full screen??

[GalaxyMTwentyOne]

It Can't Be Done

[TechiePradhumn]

Aap kahna kya chahte hai?

[Kunal2]

Watch this video
https://youtu.be/BPxNrtv311I

[mHappiee]

Here you can find if it helps https://youtu.be/9feB7kC0NEw