Welcome to the forum @26roebut!
Searching past forum posts, I see a couple of chat projects that other members have shared that should give you some ideas:
- https://anvil.works/forum/t/hangouts-like-chat-design/3141/10
- https://anvil.works/forum/t/facebook-like-chat/2729/13 (for advice about changing this to a one-to-one system instead of a group chat, see also https://anvil.works/forum/t/facebook-like-chat/2729/6
Hope this helps!