You can use the --force option to force a new head.
The --new-branch used for a named branch, in your case we are talking about anonymous branching.
The reason the "tooltip moves" is because you merged a recently changed set of changes. By doing this, you cannot do what you want.
You just need to pull the new changes from the remote, and force everything to push without merging, this will create a new head (called an anonymous branch), which can later be merged with the default branch by you or someone else after reviewing the code.
You can also use the second repository to make changes, but this is a completely different workflow.
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