How to hide the user icon?

1. Hide the user icons in the user list

.user-image { display: none; }


2. Hide the user icons in the chat area

.message-user-image { display: none; }


Note, if you like to remove the white tooltip next to each message, you can use this code
.main-message-container::before,
.main-message-container::after { content: none; }

To know how to edit web CSS, click this link.