how to edit checkbox list to horizontal

In a custom template, I created something like this to deal with exactly that, since I needed my checkboxes grouped in a div.
Seems like it’d only work if you have one grouping of checkboxes, but it’s a start and just built this an hour ago.

global $wpdb;
$form_id = fm_form_ID();
$form_shortcode = preg_replace('/fm-/','',$form_id);
$elements = $wpdb->get_results( 'SELECT COUNT( ID ) AS count
FROM wp_fm_items
WHERE wp_fm_items.ID = (
SELECT ID
FROM wp_fm_forms
WHERE shortcode = "'.$form_shortcode.'" )
AND wp_fm_items.type = "checkbox"' );

$chck_num = $elements[0]->count;

while(fm_form_have_items()): fm_form_the_item();

if (fm_form_item_type() == 'checkbox'){
if ($chck_count == 0){ ?>
<div class="form-group">
<label class="radio-inline form-wrap__label--bold"> Group Label</label>
<?php } ?>
<label class="checkbox-inline" for="<?php echo fm_form_the_nickname();?>">
<?php echo fm_form_the_input(); ?>
<?php echo fm_form_the_label(); ?></label>
<?php
$chck_count++;
if ((int)$chck_count == (int)$chck_num ) { echo '</div>'; }
} else {?>
<div class="form-group" id="<?php echo fm_form_the_nickname();?>">
<label for="<?php echo fm_form_the_nickname();?>" class="hide"><?php echo fm_form_the_label(); ?></label>
<?php echo fm_form_the_input(); ?>
</div>
<?php } endwhile; ?>

Is there a checkbox grouping function that I’m not aware of? Only started digging into this plugin today…

Ah, are you using the list (I just found that, and have been backwards engineering my way through this plugin).

The separator seems to be hardcoded to a
tag.
I had to manually change it in the plugins folder under /types/lists.php the instances of 'separator' => '<br>', to 'separator' => '</li><li>',

then in
formelements/formelements.php, inside function fe_getCheckboxListHTML, I changed
$str = implode($elementDef['separator'],$arr);

to

$str = '<ul><li>'.implode($elementDef['separator'],$arr).'</li></ul>';

to produce a list, that you can then style with CSS!