Normally any text can be typed in upper or lower case. The text can be changed to different cases like:
1. Uppercase (Capital letters)
2. Toggle case (reverse case),
3. Sentence case (first letter of each sentence Capital),
4. Capitalize every word (first letter of each word capital),
5. Lower case. (Small letters)
This can be done by:
1. Select the text to change case
2. Select Format → Change case.