The tool to select an upstream branch in git
已回答
Is the tool to select an upstream branch in git not available through the menus or actions search (⌘+⇧+A)?
I had to go through hoops to get to it: (1) open terminal, (2) execute: git branch --unset-upstream, (3) Update project, (4) get the pop-up error that asks me to "Choose upstream branch", (5) click that link

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Yes, it is currently not possible directly via a dedicated action in the UI. Please vote and follow this feature request: https://youtrack.jetbrains.com/issue/IJPL-74068.
Also, you can modify the upstream branch in the Push dialog:
Thank you.