Mobile Chat Window - Full Screen

Mobile Chat Window - Full Screen

Hello,

The mobile chat window takes up the full screen, which is highly confusing for most customers!

Using a desktop machine, I see the same happens when reducing the browser width to 800px or below. This suggests that it responsive web design, causing the switch to full screen.

Can we fix this very annoying behaviour ourselves using a custom css file? If so, can you please let me know how?

Thanks