Deleting Messages
Anyone with the "manager" or "account owner" permission can delete messages sent by themselves or by others. Team members can not delete messages
From the mobile app:
Long press on the message and select "Delete Message"
From the desktop:
Click on the three dots icon next to the message, and select "Delete"

Seeing Deleted Messages
You can see messages even after they've been deleted. You can do this by logging into your account on breakroomapp.com on a computer. From there, find your deleted message, click on the "eye" icon and select "View original message'

How does Breakroom compare with other alternatives?
Breakroom as a Crew App Alternative
Breakroom as a Slack Alternative
Breakroom as a When I Work Alternative
Breakroom as a Homebase Alternative
Breakroom as a Microsoft Teams Alternative