Combo chart swapping lines to bars

I’m doing a combo chart where I want student results to be bars and then the national average (or basically target) I want as the line.

I’ve selected combo table and it seems to have randomly allocated some data as bars and some as lines. I can’t seem to work out how to choose what is a bar and what is a line.

I’ve looked online at videos and I don’t seem to have the options they have

I’m on Mac