OrganonTweaks/Template/project/integration.php

<?php $choice = isset($values['organon_tweaks_emphasize_duedate']) && in_array($values['organon_tweaks_emphasize_duedate'], array('on', 'off'), true) ? $values['organon_tweaks_emphasize_duedate'] : 'default' ?>

<h3><i class="fa fa-umbrella fa-fw" aria-hidden="true"></i> <?= t('OrganonTweaks') ?></h3>
<div class="listing">
    <p><strong><?= t('Emphasize due date on the board') ?></strong></p>

    <label style="display:inline-block; margin-right:16px;">
        <input type="radio" name="organon_tweaks_emphasize_duedate" value="default" <?= $choice === 'default' ? 'checked="checked"' : '' ?>> <?= t('Use default') ?>
    </label>
    <label style="display:inline-block; margin-right:16px;">
        <input type="radio" name="organon_tweaks_emphasize_duedate" value="on" <?= $choice === 'on' ? 'checked="checked"' : '' ?>> <?= t('Always on') ?>
    </label>
    <label style="display:inline-block; margin-right:16px;">
        <input type="radio" name="organon_tweaks_emphasize_duedate" value="off" <?= $choice === 'off' ? 'checked="checked"' : '' ?>> <?= t('Always off') ?>
    </label>

    <p class="form-help">
        <?= t('Enlarge and bold the due date on this board. "Use default" follows the global OrganonTweaks setting.') ?>
    </p>
</div>

<div class="form-actions">
    <button type="submit" class="btn btn-blue"><?= t('Save') ?></button>
</div>
<hr>