How could I stop support from expanding outside of the model?

[slo424]

First time trying out the OcraSlicer, I have just tried slicing a test file to test some support settings.
When I sliced, the support is extended to the outside of the model, as seen in the screenshot attached. I have tried out different settings and do not seem to be able to stop it from expanding outward.

Could someone tell me how to stop the support from expanding without changing the support spacing?

Thank you in advance.