You've not said why you think you can't set it (can't find the option, can't see it where it should be, large penguin sitting on your keyboard...), so here's a brief overview to cover most of the reasons you might fail:
To enable anonymous access, you need to enable it
Now two quirks:
That should cover can't find/can't see. (I can't tell you more about the penguin, I don't know if he's one of my friends)
Phew, Atlassian Team 2021 blew by. With dozens of demos and a handful of keynotes, you may have missed some of the awesome Confluence Cloud sessions. Don't' worry, you can watch them all here or on Y...
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