Try below code:
create a xml file with below code in static/src/xml folder

file name = pos_templates.xml
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<?xml version="1.0" encoding="UTF-8"?>
<templates id="template" xml:space="preserve">

<t t-name="ProductInfoButton" t-inherit="point_of_sale.ProductInfoButton"
t-inherit-mode="extension" owl="1">
<xpath expr="//div[hasclass('control-button')]" position="attributes">
<attribute name="style">
display: none;
</attribute>
</xpath>
</t>

</templates>
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here 'point_of_sale.ProductInfoButton' is the original template which adds the info
button so you need to inherit it and add style to it if you only want to hide it
or you can replace it with empty xpath to completely remove it.

add the xml file in the menifest.py like below:
"assets": {
"web.assets_qweb": [
"ak_pos/static/src/xml/pos_templates.xml",
],
},
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