To enable the configuration settings,

1. Go to the Magento Admin Panel.
2. On the left navigation bar, click on Inline Product Grid Editor.
   The menu appears as shown below:
   
3. On clicking it you will be navigated to the Configuration page.
   In the left panel click on Inline Product Grid Editor. The sections open as shown below:
   
4. Under the settings in Enable option select Yes to enable the extension settings.
5. Click on the Save Config button to save the settings.