Hi,
I have updated the Collapsed Topics and Columns formats for M2.6 / 2.6.1 to support the Elegance theme (https://moodle.org/mod/forum/discuss.php?d=254784):
CT: https://moodle.org/plugins/pluginversion.php?id=5430.
Columns: https://moodle.org/plugins/pluginversion.php?id=5431
Cheers,
Gareth