--- a/src/pyams_content/component/theme/zmi/manager.py	Wed Sep 12 16:57:06 2018 +0200
+++ b/src/pyams_content/component/theme/zmi/manager.py	Wed Sep 12 18:11:41 2018 +0200
@@ -70,6 +70,7 @@
     prefix = 'manager_themes.'
 
     legend = _("Selected tags")
+    dialog_class = 'modal-large'
 
     fields = field.Fields(ITagsManager)
     edit_permission = MANAGE_SITE_ROOT_PERMISSION