To change the letter case, select your text, then head to the Typography section of the Design panel. Click the 3-dots menu to open Type settings. In the Basics tab, you'll find the options to adjust your text to:

• Uppercase: Changes all selected text to UPPER CASE.
• Lowercase: Changes all selected text to lower case.
• Capitalize: Makes the first letter of every word Upper Case, known as Title Case.
• Small Caps: Converts text to SMALL CAPS, where uppercase letters are presented in a smaller size that matches lowercase letters but with distinct proportions.