I use Magento 2.2.
Changed session destination from file to Redis.
Is there a command to save back to a file?
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You can change the configuration either in env.php or cmd
Can change session configuration in app/etc/env.php
'session' => array ( 'save' => 'files', ),
Using Command Line
php bin/magento setup:config:set --session-save=files
Hope it helps you.