CTRL+I is the shortcut to show and hide the search bar .

i guess the question is "why ctrl+i ?"

Because escape is already assigned to another action so i chose CTRL+I

Ok why not but still why CTRL+I ? It will show search no ?
By default CTRL+I is for italic in editor mode.

By default a shortcut should logical with associate action.

So it is not necessary to use a shortcut to view and hidden de search bar?

I didn't say that it's not necessary to have a shortcut, but it's a problem to use not intuitive shortcut (and it's already used).

For example CRTL+I is logical for change to italic
CRTL + S => save
etc.

But CTRL+I for hide/show searchbar is not logical no ?

Can you tell me what I can put as shortcut ?

As we hide/show it, before to set focus to this line we used ALT+Q (quick focus) so perhaps we can reuse it.
Or ALT+S (for searching)
Or I don't have more idea for the moment.
But we need a shortcut which is not used.