Answer

Option 1: Format a single instance of a field

1. On the Marks card, right-click the field on Label and select Format...
   Note: You must click on the green field, not on the box named Label
2. In the left-hand Format pane, under Default, in the Numbers dropdown, Select Number (Custom).
3. Change the number of decimals to 0.

Option 2: Change the default format of a field

1. In the left-hand data pane, right-click the field and select Default Properties > Number Format...
2. In the Default Number Format dialog, Select Number (Custom).
3. Change the number of decimals to 0.

Option 3: Change the default format of all field for one worksheet

1. Navigate to Analysis > Table Layout > Advanced...
2. In the Table Options dialog, in the Default number format section, select Manual.
3. For Decimal places, type in 0.

Option 4: On Tableau Server or Tableau Cloud

1. On the Marks card, right-click the field on Label and select Format...
2. In the pop-up menu, select Number.
3. Change the number of decimals to 0.