You can always use CLI command for managing modules.
Disable module:
$ bin/magento module:disable Vendor_ModuleName
Enable module:
$ bin/magento module:enable Vendor_ModuleName
And you can check status of all modules:
$ bin/magento module:status
It is useful to build a habit of controlling your installation via bin/magento. Also it will help to avoid any new features introduced for module commands.
Hope it helps !