Hi so switching to a local backend seems quite simple:

pulumi login --local

However I'm unclear on how to switch back again as this doesn't seem as simple. I'm currently at:

pulumi logout; pulumi login

Manage your Pulumi stacks by logging in.
Run `pulumi login --help` for alternative login options.
Enter your access token from <https://app.pulumi.com/account/tokens>
    or hit <ENTER> to log in using your browser                   :

Open the browser, login to pulumi.com, create a new token, paste it into the terminal. I already have a login and token so why is this needed? Is there something as simple as switching to a local backend? e.g.

pulumi login --standard

At the moment you can only have one "global" backend on your machine, rather than one per project / stack etc. When you change backends it means when you next run

pulumi up

it'll be authenticating against whatever backend you last logged in to

Ah, that should be my 6th question today!

And when you logout it therefore requires you to login (globally) before you can run a pulumi up again

Why we can't have backend per project?

I actually want to use two logins for the same project

So at the moment, you'll have to login and logout again to move between the two. I don't recommend it as it might cause your stack to get messed up. We do have an issue open discussing having multiple backends: https://github.com/pulumi/pulumi/issues/6029

Yeah I understand the possibility for confusion, but if I use different stack names it shouldn't be an issue. I just don't want the extra lag when testing.