@Pravin_1: If you go to Settings > Display > Navigation Bar > Full Screen Gesture > More Options, can you see an option called 'Allow Back Gesture On Keyboard'? If so, active this option and this should hopefully resolve your issue. What problems were you having with the handwriting feature?
I have tried it both ways. The first screenshot is in expanded mode. Here I can only write in the black box.
In the contracted mode I can write anywhere on the screen.
In both instances it will convert my writing to text. However, in the old version of this box I had a lot more formatting options than I do now. For example, I could choose numbered bullets and indent. The only punctuation options I had were a comma and a period. I didn't need the others that are now offered as I had no problem with drawing what I wanted and having it convert properly.
The other thing I really miss is the ability to either split two words apart or pull two parts of a word together. You did this by tapping the problem words or word parts on the text screen. That portion of text would appear on the writing screen and I could split text by drawing a vertical line where I wanted a split or pull two parts together by drawing the lower half of circle between the parts. Now I can only find and highlight a word or word parts to cut, copy, or replace a previously written word or parts of words. Very inefficient.
I would like to have the old writing screen back.
