Unfortunately, CL has specifically made theses titles using a format that doesn't allow the normal range of editing control, and it looks like the only attributes you can change are the the actual text characters, text color, and whether all characters in each field are bold or italic or not.
To make a title with a different sized font, I think you'd have to create it from scratch. At least you could use the graphics/animation from the Minimalist pack and leave the desired text field blank, then place your new text with the appropriate effect on the track below so it will appear on top of the graphics/animation.
YouTube/optodata
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