How do I resize/adjust multi-windows on my Samsung S4?

Help please, I'm having problems with my multi window in my phone.
For example I want to watch a video while checking my mails usualy, all we need to do is to play the video then click on multi window and select mail. The thing is whenever I select something from there, it will occupy the whole screen. It wouldn't give me options to resize it so I can see both the video and my mail. Hope you guys can help me. Hopefully you understand my question. Thanks!

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