Hi there,
That is usually possible with custom Javascript code which is outside of our support scope, But a partial solution is the CSS method. You can try the CSS code below:
iframe {height: 100vh;}
Kindly open up new threads for additional questions as it will help us to focus on each issue and give you a better support which you deserve. Having a long threads makes the maintaining job harder and also it will be harder for the other customers to find the correct information if they have similar issues. You are always welcomed to reply to this thread to follow up the same question.
Thank you.