Unlocking screen with code is small

Hello, UmeshMD.

Welcome to Apple Support Communities.

From reading your post, we understand that you want a zoom on the keyboard when typing in your passcode. Have you checked out all of the Zoom features in this article: Zoom in on the iPhone screen

"Use Zoom

1. Double-tap the screen with three fingers or use accessibility shortcuts to turn on Zoom.
2. To see more of the screen, do any of the following:

• • Adjust the magnification: Double-tap the screen with three fingers (without lifting your fingers after the second tap), then drag up or down. Or triple-tap with three fingers, then drag the Zoom Level slider.
  • Move the Zoom lens: (Window Zoom) Drag the handle at the bottom of the Zoom lens.
  • Pan to another area: (Full Screen Zoom) Drag the screen with three fingers.

1. To adjust the settings with the Zoom menu, triple-tap with three fingers, then adjust any of the following:

• • Choose Region: Choose Full Screen Zoom or Window Zoom.
  • Resize Lens: (Window Zoom) Tap Resize Lens, then drag any of the round handles that appear.
  • Choose Filter: Choose Inverted, Grayscale, Grayscale Inverted, or Low Light.
  • Show Controller: Show the Zoom Controller".

You can always use this link to submit feedback on features you'd like to see implemented: Feedback

Cheers!