Is there an extension for drilldown menu on mobile?
And which is the best one?
You can refer Magento 2 Mega Menu Pro Extension developed by LandOfCoder.
Using this extension, you can easily get drilldown menu on mobile.
Besides, there are a lot of helpful features as listed below:
When purchasing this extension, you can have it freely installed on your website by our developer. For further information, please contact LandOfCoder via:
Hope this helps!