in germany the week starts on monday. in some countries like england or north america, sunday is the first day of the week. by default, the week start on the LG smartphone is set according to the locale associated with the selected language (region). independent of this, the week start can also be set manually in the calendar.

Android 9 | LG UX 9.0
Step 1:  Open the  Calendar -App
Step 2:  Open the  Menu
Step 3:  Open the  Settings
Step 4:  Tap on  Calendar
Step 5:  Tap on  Start week on
Step 6:  Choose between  Locale default ,  Saturday, Sunday  and  Monday
  1. Open the Calendar-App
  2. Open the Menu
  3. Open the Settings
  4. Tap on Calendar
  5. Tap on Start week on
  6. Choose between Locale default, Saturday, Sunday and Monday

LG Instructions