Hello Vargolino,
Greetings of the day!
There are two different search option available.
1. Product search
2. All site data search
First link is used for all site data search. This is wordpress default search feature so layout is diferent.
Products will be searching from the top header menu. To show header search menu please add below CSS code.
Follow the below steps to add custom CSS.
1) Please log in to the admin area
2) Go to “Appearance >> Customize >> Additional CSS”.
3) Paste the below code in “Additional CSS” and save it afterward:
div#sticky-wrapper
{
z-index: 999;
}
Hope it will work for you.
Thank you.