Unknown origin floating search button

Hello dear all.

We have a floating search icon or button, specifically a floating magnifying glass that we can’t control and we don’t want.

When you click it, it is an internal Google Search. Where can I disable it?

Here you can see a picture.

https://drive.google.com/file/d/1rlZvLClz1pJXR8qnGqwtRJslArC_KUdB/view?usp=sharing

Thanks in advance.

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