Okay so the tumblr update that lets you see if people are active or not is up and running. It shows a green dot next to the icon in the chat if you are on. This is what it looks like. The ones with the green dot haven’t turned it off yet. The ones without did turn it off.
If you do not want to be seen by other people here is what you do:
On desktop: go to setting then account and find this and turn it off.
If on mobile —- go to settings > general settings > privacy
you will see the same thing but it will say “Let people see that you’re active” and turn that off
(you will still be able to see those that did not turn theirs off but people will not be able to see your dot.)
also, you do not have to do this on both mobile or desktop it is one or the other whichever is easier for you!