You can create visualizations with multiple chart types by using Series Types. Read how to use Series Types here.
Changing the Arrangement
When you create a mixed type visualization, the chart types will be arranged by the order their respective measures are displayed in the table. From left-to-right will be top-to-bottom.
For example, this Look displays with the Orders Count columns in the front:
But if I want the Orders First Purchase Count line to appear in front, I can switch the order of the measures like so: