Hey coolz202,
Congrats on the iPhone 12 Pro! It's definitely important the icons and text are the size you prefer. Let's see if what the display is set to, and check the "Text Size" settings while we're there. Tap Settings > Display & Brightness. At the bottom, is "View" set to "Standard" or "Zoomed"? If it's set to "Zoomed" change it to "Standard" and that should help with the app icon size. Then let's go back to Settings > Display & Brightness" to check the "Text Size". Make the necessary adjustments here, then go back to your Home screen to check the app icon and text size to see it's more what you expect. Here's a bit of information about both settings:
Change the font size on your iPhone, iPad, and iPod touch
Magnify the iPhone screen with Display Zoom
Let us know how that goes.
Cheers!