Create a gallery grid with Essential Grid
Please navigate to the Gallery admin menu tab and add a couple posts. All posts need to contain a featured image and need to be assigned to at least one gallery category (please do not use the gallery tags).
Then navigate to Ess. Grid -> Settings (button of the specific grid)
Then follow these steps:
1. Click the Source tab
2. Set Post Types to Gallery
3. Select the categories you would like to show
Please don't forget to save the settings (see image above for the setting fields).
The grid is configured now and can be displayed on your website by using the 'Essential Grid' widget in the page builder, within the widget you can select the grid you want to display.