Hi  @zgutzwil  Thank You for your question.

This got me thinking. My calendar is Monday - Sunday. For the life of me I couldn't figure out how it came to be that way. Awfully grateful that it is.

I did a bit of digging and found a possible answer.

Go to your Canvas Account in the left hand side Global Navigation Menu, then go to Settings and change the language to "English (United Kingdom or Australia)". When you access the calendar again, it will start on Monday. Is your language set to something other than "English (US)"?

 I hope this works for you.

Keep us posted.