Happy to see you’ve decided to join our ranks! Welcome, @Purely_Diamonds 
Many thanks for the feedback!
This idea is already on the Wishlist and I’ve merged your comment with it. If more users support this request, we might take it into consideration in the future updates.
In the meantime, we have a custom solution to add the Close button to the chat bubble. Check this guide to see how you can do this 
- Chats: How to add a Close button to the chat bubble