Card Size Options
The card size options changed the size of your bingo cards. Small is the smallest available size card and the rest are respectively larger, with the largest being XLarge.
Make sure you select the 'Alert' button on the bottom bar before you change over the card size to see all options.
Daub Mode Options
Manual Daub allows you to daub each number on each bingo card yourself by clicking/tapping that number.
Semi-Auto Daub Mode allows you to daub the numbers by clicking/tapping while automatically daubing the same number that you clicked on each of the bingo cards you have.
Auto Daub Mode automatically daubs all of your bingo cards for you when your numbers are called.