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The new project wizard is meant to create new projects from templates- it will deploy the new project as a instantiation of the template to a new or existing GH repo (in a subdir). If you are using an existing project from an existing repo, its a different process: you initialize the stack using the cloud backend (appears in Stacks). Then you can configure deployments in the Settings/Deploy (or choose 'configure deployments' from the context menu on the stacks page). You can input your existing GH repo/branch etc.

@billions-river-87988 Thanks for pointing me in the right direction, although I've to admit the process is kinda bumpy, because I've to use the CLI to create the stack from a GH repo which I've to clone first somewhere and run the CLI.

yes, i tend to agree- its a use-case I hadn't really thought about until you mentioned it