Hey there Jlad121,
Thanks for reaching out to the Apple Support Communities. Just to confirm, you've customized your text size under Settings > Accessibility > Display & Text Size > Smaller Text, but that was unable to alert the size of the text for notifications, is that correct?
If so, also check the Display Zoom settings under Settings > Display & Brightness. If the View is set to "Larger Text" or "Zoomed" try changing it to "Default" or "Standard" and see if that resolves the issue. Magnify the iPhone screen with Display Zoom - Apple Support
See more info about text size here: Change the font size on your iPhone, iPad, and iPod touch - Apple Support
Let us know if that's able to help.
Take care.