I only use GMail for emails and not for chatting so I decided to remove GMail chat box on the left side. It gives me more space to view my Inbox, other folders and other labels. You can re-enable the chat anytime in case you want to utilize this feature again.
Steps to Remove GMail Chat Box
1. Sign in to your GMail account.
2. Click the settings icon.
3. Select settings, then go to “Chat“.
4. Tick the circle beside “Chat off“. If you want to enable Chat feature you can tick the circle beside “Chat on”.
5. Scroll down until you reach the bottom of the page, click “Save changes“.