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You can set developer mode either from command line or change from the file
Command :- php bin/Magento deploy:mode:set developer
File :- Open env.php at ( app/etc/env.php ) and find application mode 
and change default to developer mode
        -- MAGE_MODE' => 'default' to MAGE_MODE' => 'developer'

You can set developer mode either from command line or change from the file

Command :- php bin/Magento deploy:mode:set developer

File : Open env.php at ( app/etc/env.php ) and find application mode and change default to developer mode -- MAGE_MODE' => 'default' to MAGE_MODE' => 'developer'

You can set developer mode either from command line or change from the file
Command :- php bin/Magento deploy:mode:set developer
File :- Open env.php at ( app/etc/env.php ) and find application mode 
and change default to developer mode
        -- MAGE_MODE' => 'default' to MAGE_MODE' => 'developer'

You can set developer mode either from command line or change from the file

Command :- php bin/Magento deploy:mode:set developer

File : Open env.php at ( app/etc/env.php ) and find application mode and change default to developer mode -- MAGE_MODE' => 'default' to MAGE_MODE' => 'developer'

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You can set developer mode either from command line or change from the file
Command :- php bin/Magento deploy:mode:set developer
File :- Open env.php at ( app/etc/env.php ) and find application mode 
and change default to developer mode
        -- MAGE_MODE' => 'default' to MAGE_MODE' => 'developer'