Why does only my Facebook messenger account doesn't show the head chats?

[RyzonPT]

Well for some reason when ppl send me messages, my Facebook messenger doesn't create the head chats, there isnt even the option to enable it on the messenger definitions but if i change the account it runs normal, the head chats/icons appears on the definitions and everything is normal on different Facebook account, only in my account it doesn't show up, how can i turn it enable on my account?

Samsung S5, 6.0.1 anyway i tried with different phones and its all the same so i think is the Account.

 

[dpw09]

In Messenger, click on your profile button on the top right.

Scroll down to the "Chat Heads" setting and toggle it on.