Under snippets. Replace this code in product-from.liquid at line 194. This code is for POPOVER selector.
{%- for value in option.values -%}
{%- endfor -%}
With the below code.
{%- for variant in product.variants -%}
{%- endfor -%}
And then add this code in the theme.css file at the end.
button.hide_variant {
display: none;
}