In the 'Calendar' tab Left side pane will list your calendars. click on name of calendar to select it When you hover over a selected calendar you will see 3 small dots appear - click on them to see options.

A right click on calendar name also gets options.

Note: select the 'Properties' option and it offers you the ability to change the colour. click on the colour rectangular box to open the colour palette.

Really I do not like it - those dots need to visible at all times.

The left side pane doesn't show my calendars.

Toad-Hall, I accidentally found the pane, it was hidden and I didn't even know it was there until your reply. It takes up almost half of the screen!

Thank you,  MaryJo

you can drag the pane wider and narrower with your mouse.