How can I edit/modify the sprite file of unity game?

[khunawv]

Hello everyone, I have struggled in how to increase and change the visible area of texture2d via sprite.
Now I have changed the image texture2d of unity game and reimport to game resource. Yes it can change
But because there is sprite in unity So it can show only visible area in Sprite file
So I would like to know how to edit and change the visible area of Sprite file?
Thank you very much