If you use its Chat application, Google will be very happy, so it is very happy to push it beyond the scope of the actual application. Last month the tool was available to ordinary users (no need to pay for access to Google Workspace), and now they can also integrate with Gmail. But it is not enabled by default, so if you want to use it, you must dig in the settings menu.
First, open the side menu in Gmail, scroll all the way down to the bottom, and click “Settings.”
Scroll down to the “General” area of the list. The first option should be “Chat (Early Access)”. In the pop-up alert, click “Try”.
Gmail will restart, which may be a bit harsh. If it does not automatically pop up, please open it again and you will see a new bar at the bottom of the interface. “Mail” is your standard mailbox, “Chat” will take you to the official Google Chat application for all text conversations, and “Room” is the ongoing conversation view. (Like Slack, but basically useless.) You can switch between the three views at any time.
If you want to delete “Chat” and the bottom navigation bar completely, and you really want to delete it, just follow the steps above again.