add an option to force settings to users

templates/settings/admin-form.php

@@ -473,6 +473,20 @@ $choicesSizes = [
     </div>
 
     <div class="section">
+        <div>
+            <label for="side-menu-opener-only">
+                <?php p($l->t('Force this configuration to users')); ?>
+            </label>
+
+            <select id="side-menu-force" name="force" class="side-menu-setting">
+                <?php foreach ($choicesYesNo as $label => $value): ?>
+                    <option value="<?php echo $value ?>" <?php if ($value === $_['force']): ?>selected<?php endif; ?>>
+                        <?php echo $l->t($label);  ?>
+                    </option>
+                <?php endforeach; ?>
+            </select>
+        </div>
+
         <input type="hidden" id="side-menu-cache" name="cache" value="<?php print_unescaped($_['cache']); ?>" class="side-menu-setting">
 
         <button id="side-menu-save" class="btn btn-primary"><?php p($l->t('Save')); ?></button>