An important aspect when collaborating in teams is knowing when your team members are online. You can use Heyweek's online presence indicator to see when a team member is online. They'll have a green dot next to the avatar.
At times though, you might like to work in stealth mode and not let your team members see that you are online. In that case, you can set yourself as active or inactive from the user menu in the top right corner of the app.