To change small letters to capital letters in Microsoft Word, you can do the following:

1. Select the text you want to change.
2. Go to the Home tab.
3. In the Font group, click the drop-down arrow next to the Change Case button.
4. Choose UPPERCASE to convert all selected letters to capital letters.

Alternatively, you can use the keyboard shortcut:

• Select the text.
• Press Shift + F3 repeatedly to toggle between lowercase, UPPERCASE, and Capitalize Each Word until the desired case appears.

This method works effectively for changing text cases quickly in Word documents.