No button to post message, only enter/new line

I use NeoChat v25.04.3 on Postmarket OS / Fairphone 5

Ref: org.kde.neochat/aarch64/stable

Commit: 3bd4575deb463f1572f5df023049c0f3924cbd844589cb4d721968afd8fa18dd

I don’t know how to press enter in a way to post a message.
I hope video can give more info about the situation.

Please share your ideas how to post a message.

My guess need to create a separate button.