Oh I understand what you mean now. It's an intended default behavior for mobiles to close the mobile keyboard first.
You can change that on the General Opitons -> Mobile behavior panel: https://i.imgur.com/RO1X9dy.png
Please note, that this might be a less convenient option for mobile users, as the keyboard will hide once the search is completed and mobile browsers automatically loose the focus from the input field.Best,
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