Another question - please could someone point me to which settings page I can change these merge strategy options from?

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in GitHub I have this setting

GitHub's docs for this here: https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges I suspect you may need to allow one type and disallow other types.

hm, the github merge UI shows me the other options though - it just seems to show squash only in Graphite

I think there may be a sync delay between the settings state in GH being reflected in Graphite

I haven't changed that setting recently, it was like that for at least weeks!

Oh you're using the merge queue. There is a specific page with merge queue settings for each repo that this will be configured in, see: https://app.graphite.dev/merges

that's perfect, thank you!

ah unfortunately not, only when doing a non-merge queue stack merge