At the moment, if these fragments are part of the same flow, there will always be a key change indication at the end of a system (unless you’re willing to do some awkward workarounds, like scaling it to 1% in Engrave mode). I think you need a setup with a separate flow for each example/exercise. You can choose a different barline type as final barline for a flow, or hide it altogether.
There has often been discussion on this forum about how to setup projects with lots of short exercises, and the pros and cons of using separate flows for that type of work. Maybe if you search for ‘exercise’ and ‘key signature’ you’ll find some of these threads, like here or here, but the issue has come up quite more often.
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