The configuration changes performed on devices through NSM (either in FIREWALL VIEW or by applying templates to device groups) need to be committed (so that the changes are locked), and then deployed on the devices to push the updates to the devices.
To view pending configurations
Click PENDING CONFIGS at the top of the page.
The operations are listed, for example: add, update, and so on. Click the caret icon next to the listed operation to see the JSON script of the operation performed. To perform commit and deploy, refer to Committing and Deploying the Updates