Also, you can modify existing cargo limits, or create new sets.
If you change a limit it’ll change for all fleets using that set, so be careful.
These are editted on the faction view, “Cargo Limits” panel. If you select a set then a cargo type on the right handle panel an “edit limit” tool should appear on the right hand side of the panel. The limits are set in basis points (hundredths of a percent)