I want to ask if there is any way to stop adjusting website size in web viewer, I want to lock the size.
I don't know how to do that. Sorry.
by setting their sizes in Arrangements.
Is that what you want?
It can only be done within the web page itself. Are you viewing your own web page? If so, add this header line:
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">