Thanks mediajf and MakubX. I might try those things. But really the main issue here is, I hope they look into this and with future releases, they fix this apparent GIF-resizing issue. (If that is indeed what is happening).
The background in the animation (the blue bullseye animation) is an MP4. That doesn't seem like it was affected. That didn't' resize with the update.
It was just the GIF images that re-sized.
If I remember correctly... and I could be wrong... I thought that older versions of Express Animate allowed you to set an actual specific size of your Canvas... not just choose 16:9 ratio, or 1:1 or 4:3. I thought it allowed you to say... 1280 x 720 or 1920 x 1080 ? So, maybe that's has something to do with it? Not sure if someone can confirm that older versions had that option or not? I may be mistaken.