Removing the"Suggested" List in Teams Chat

This is an incorrect answer. Suggested Replies are automatic phrases to reply to a message. This has nothing to do with Suggested Contacts. At this point, there is no way to manipulate suggested contacts. I am currently running a test to see if this is integrated into Outlook. I have cleared my Auto-Complete List through Outlook options. I will report in 24 hours whether this works.

Waited 3 days to see if Outlook was the culprit. It is not. This needs to be fixed!

Here's how to fix it!

Download the extension "Stylus". Make sure that it is not "Stylish" - which has security flaws and is deprecated.

Stylus lets you change the CSS of your page. Create a stylus entry for the page and add the content below:

@-moz-document url-prefix("https://teams.microsoft.com/v2/") {
    /* Remove "Suggested Chats" from the left panel of Microsoft Teams Chat */
    #SUGGESTED, #suggested-project-group-chat{
        display:none;
    }
    [id^="chat-list-suggested-contact"] {
        visibility:hidden;        
    }
    [data-testid^="chat-invite-button"] {
    display:none;
    }
}

Note that periodically MS changes the names of their CSS ids so this may stop working in a year.
Also, you can decide if you want "visibility:hidden" or "display:none"

Here's how to fix it!

Download the extension "Stylus". Make sure that it is not "Stylish" - which has security flaws and is deprecated.

Stylus lets you change the CSS of your page. Create a stylus entry for the page and add the content below:

@-moz-document url-prefix("https://teams.microsoft.com/v2/") {
    /* Remove "Suggested Chats" from the left panel of Microsoft Teams Chat */
    #SUGGESTED, #suggested-project-group-chat{
        display:none;
    }
    [id^="chat-list-suggested-contact"] {
        visibility:hidden;        
    }
    [data-testid^="chat-invite-button"] {
    display:none;
    }
}

Note that periodically MS changes the names of their CSS ids so this may stop working in a year.
Also, you can decide if you want "visibility:hidden" or "display:none"

This is a web extension. Does it fix the Teams app?

My fix is just for BROWSERS. It works with Chrome and Firefox. I haven't tested anything else.

Too bad about the app — which I can't fix.
(since I'm using Linux, they don't have a desktop app for me!)

Hi Adebayo, followed your steps and Suggested continues to appear in Teams chat.

Gisele