Change the week start setting for Front Calendar
Front Calendar defaults to using Sunday as the start of the week, but this may not be suitable for many users. You can update the calendar week start day to any day.
Click your avatar on the top left of Front and choose Settings.
Click on My preferences on the left and then scroll down to the Week Start setting. From here you can use the dropdown to pick the start of the week.
Click the Save button on the top right to save your changes.