Cant find the size adjustor

[KhoiTran]

Hello, im trying to make the data larger and easier to see from further away but I cant seem to find any size adjusters for it. With other data there has been a symbol size bar to adjust, but for this one it only gives me transparency. 

[RussRoberts]

It looks like you are styling polygons. There wont be a size adjustment for polygons just controls on your fill.