The short answer is that you can't, because each Cartoon Title is made up of 200 individual PNG images and each of them would need to be scaled exactly the same way for the animation to work. This is true for any of the animated title add-on packs as well.
There are older posts here on the forum with the necessary steps, but it's probably more work that it's worth.
Unless you've changed the default installation folder in the App Manager, the downloaded titles should be stored in the
C:\Program Files\CyberLink\Templates\Creative Design Pack folder. You can drill down 3 more levels to see the images for each cartoon title.
Back on PD's timeline you can use the Particle Designer to change everything BUT the size - color, location, level of animated effects and how they fade in/out as shown here:
The only way to resize these kinds of titles would be to get everything set up the way you want, then place a color board behind it and produce it.
You can then import the produced title, chroma-key out the color to make it transparent then resize and place it in front of your desired clip. Depending on the animation, colors and chroma-key settings, that may or may not work well enough for your needs.
One last thing is that you can't directly paste images here. You can upload them to an image sharing site like Imgur.com and paste the BBCode inline with the text (like I've done), or simply use the Attachments button below the forum's text box so other users can download it.