I am using 5.1 as well. What I see is that if I am in a Space, it takes me to the Home Page for that space. If I am at the Dashboard, or something like an Administrative page, it will take me to the Home page for the Site (as defined in the General Configuration).
I can see where to change the logo on both the site level or the space level, but I don't see an option to associate a URL or action with it.
That's weird, no matter where I am it always takes me to Dashboard...
And it's the same behaviour someone described in the last comments here:
Hi my Community friends! For those who don't know me, I'm a product marketer on the Confluence Cloud team - nice to meet you! For those of you who do, you know that I've been all up in your Co...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs