Setting a default chart type
Reports look really nice when they are consistent. To this end, Administrators have the ability to set a default chart type for new measures that are added to the account.
Open System Settings in the control panel and click on Admin Options.
Click on Default Series & Charts.
Click on the Charts tab. Use the Default Chart Type dropdown menu. This will be the default chart for whenever anyone adds a new measure. Use the Update Chart Legends to bulk edit the location of all legends in charts across your account. Click Save.