How to remove other kernel displaying on Startup?

I installed Zorin OS Lite 15.3 i686, and on startup there are 3 versions of kernel to choose from, -96, -94 and -45 plus recovery mode of each. Only the 5.4.0-94-generic is not laggy. How do boot it as default? And is it possible to delete others because I don't use them? Deleting them might help save more disk space.

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