Hello Abdullah Alobaid <

The Preview option is only available via  the Editor/View or the sidebar.

Its not possible to reposition this elsewhere within the UI.

Hi Abdullah Alobaid,

First click on the the pin icon:

An then drag the window by the title bar wherever you want it to be positioned. Have a look at the following video:

https://community.sdl.com/product-groups/translationproductivity/f/studio/26660/studio-window-position

thank you brother and I hope they would make possible in future. 

are you sure brother? I think it like what Steven said. it cant be moved below. 

thanks

I've just moved the Preview window to the bottom in Trados Studio 2021 and 2019. Is this what you mean?

What happens when you try?

It moved just as you said. THANK YOU BROTHER JESUS