Bug Report Window glitches out when not in fullscreen

There is this website for streaming artist and so on,
itrecommend this program for it and thats the end of the intro.

Now, I wanted to stream only using one program/window.
so when I go on google or look at my desktop, it doesn't reveal personal information like emails,
passwords, skype and so on.

I looked around and found on Windows Capture can set to only one window.
Problem is,
when I want to make that specific window "smaller" Instead of predicting, it will be still
the same when streaming, it shows the window the same size AND another like it but frozen (with additional mouse
moving and flashing)

So I want to know; Can I manipulate the window size on my screen and not affect the stream


In Fullscreen (Warning: huge image(note: this is on gaming capture))
SsEiR09l.png
Not in full screen (huge image and in window capture)
inb4: what a weeb background
lNtmwcEl.jpg
 
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