Display label and checkbox separately for bootstrap 4 in Twig for Symfony 4

register.html.twig

{% form_theme form _self %}

{% block checkbox_widget -%}
    {%- set parent_label_class = parent_label_class|default(label_attr.class|default('')) -%}
    {%- if 'checkbox-custom' in parent_label_class -%}
        {%- set attr = attr|merge({class: (attr.class|default('') ~ ' custom-control-input')|trim}) -%}
        <div class="custom-control custom-checkbox{{ 'checkbox-inline' in parent_label_class ? ' custom-control-inline' }}">
            {{ block('checkbox_widget_base') }}
        </div>
    {%- else -%}
        {%- set attr = attr|merge({class: (attr.class|default('') ~ ' form-check-input')|trim}) -%}
        {{ block('checkbox_widget_base') }}
    {%- endif -%}
{%- endblock checkbox_widget %}

{%- block checkbox_widget_base -%}
    <input type="checkbox" {{ block('widget_attributes') }}{% if value is defined %} value="{{ value }}"{% endif %}{% if checked %} checked="checked"{% endif %} />
{%- endblock checkbox_widget_base -%}

{% block checkbox_label %}
    {# {% block _user_registration_form_termsAccepted_label %} - use this if you need it for just a single field, amend accordingly to your form type/field #}
    {#- pulled from bootstrap_4_layout.html.twig and appended |raw to the end of label line -#}
    {% set is_parent_custom = parent_label_class is defined and ('checkbox-custom' in parent_label_class or 'radio-custom' in parent_label_class) %}
    {% set is_custom = label_attr.class is defined and ('checkbox-custom' in label_attr.class or 'radio-custom' in label_attr.class) %}
    {%- if is_parent_custom or is_custom -%}
        {%- set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' custom-control-label')|trim}) -%}
    {%- else %}
        {%- set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' form-check-label')|trim}) -%}
    {%- endif %}
    {%- if not compound -%}
        {% set label_attr = label_attr|merge({'for': id}) %}
    {%- endif -%}
    {%- if required -%}
        {%- set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' required')|trim}) -%}
    {%- endif -%}
    {%- if parent_label_class is defined -%}
        {%- set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' ' ~ parent_label_class)|replace({'checkbox-inline': '', 'radio-inline': '', 'checkbox-custom': '', 'radio-custom': ''})|trim}) -%}
    {%- endif -%}
    {%- if label is not same as(false) and label is empty -%}
        {%- if label_format is not empty -%}
            {%- set label = label_format|replace({
                '%name%': name,
                '%id%': id,
            }) -%}
        {%- else -%}
            {%- set label = name|humanize -%}
        {%- endif -%}
    {%- endif -%}
    <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>
    {{- label is not same as(false) ? (translation_domain is same as(false) ? label : label|trans({}, translation_domain)) -}}
    {{- form_errors(form) -}}
    </label>
{% endblock %}
...
<div class="form-group">
    <div class="form-check">
        {{ form_widget(form.termsAccepted) }}
        {{ form_label(form.termsAccepted) }}
    </div>
</div>