When I enable Developer mode in Magento, I don't see it in the Configuration Settings: 
I used command
php bin/magento deploy:mode:set developer
I'm using Magento 2.2.9 and Ultimo Theme version 2
When I enable Developer mode in Magento, I don't see it in the Configuration Settings: 
I used command
php bin/magento deploy:mode:set developer
I'm using Magento 2.2.9 and Ultimo Theme version 2