Calendar App: why can't I see settings?

First let me say that we're new to the Smartsheet Calendar App. I started the Calendar worksheet but my manager wanted a chance to set-up the Calendar App this time around ('cause it's fun). Even though I'm the owner on the worksheet (she's the Admin - see attached screen shot), I cannot edit the settings in Calendar App (see attached screen shot). I've noticed this oddity previously, but it only became an issue today when she asked me to complete the calendar today. Am I doing something wrong or is this a 'feature'? If it's a feature, why would you not want multiple users to have access to the Calendar App settings? Thank you!