Hi there,
Please open the jlfeaturebox.html.twig then change

{% set linkscroll %}
{% if item.buttonlink|e matches '/#/' %} jl-scroll{% endif %}
{% endset %}

to

{% set linkscroll %}
{% if particle.class != 'no-scroll' %}
{% if item.buttonlink|e matches '/#/' %} jl-scroll{% endif %}
{% endif %}
{% endset %}

after, open feature box particle, add no-scroll class to the particle to remove scroll feature 🙂

Let me know if it works for you.