Answered
@avery.ng you need to manually select the type size before you can increase the font size with the arrows:

This is my preferred method in changing font sizes by selecting the text with the type tool, and use the keyboard shortcuts:
Command Shift < will decrease the font size by 1
Command Shift > will increase the font size by 1
Sign up
Already have an account? Login
To post, reply, or follow discussions, please sign in with your Adobe ID.
Sign inSign in to Adobe Community
To post, reply, or follow discussions, please sign in with your Adobe ID.
Sign inEnter your E-mail address. We'll send you an e-mail with instructions to reset your password.

