Environments header alerts: what does this mean?

Thank you @Arnaud_Moncel
my concern is not about the color, but about the relationship between environments and branches.

In my DEV-xxxx remote environment I did not create any branch (it’s not possible at the moment, see Questions about the new development workflow - #12 by louis) so I can’t understand why this should have a branch. You say that a branch is created by default.
Ok.

Now, why this is not the same in my STG-xxxx remote environment?


The wording is different. What does this _DEFAULT difference mean? These two environment should have the same features, because they both are remote and the color doesn’t matter. Isn’t it?

More over, if I have some change in the layout in my DEV-xxxx remote environment with the forest web interface, this is what I can see:

What is the meaning of “deltas” and branches?

Thank you.