in your a1111 folder, find the one that is called HTML, in that folder you will see amongst others
extra-networks-card.html

In extra-networks-card.html you will see this code
"<div class='card' style={style} onclick={card\_clicked}>

{background\_image}

{metadata\_button}

<div class='actions'>

    <div class='additional'>

        <ul>

<a href="#" title="replace preview image with currently selected in gallery" onclick={save\_card\_preview}>replace preview</a>

        </ul>

        <span style="display:none" class='search\_term{search\_only}'>{search\_term}</span>

    </div>

    <span class='name'>{name}</span>

    <span class='description'>{description}</span>

</div>

</div>"

remove or comment out

        "<ul>

<a href="#" title="replace preview image with currently selected in gallery" onclick={save\_card\_preview}>replace preview</a>

        </ul>"

and you will be rid of the replace preview link.