These settings can be configured under the images settings.
Choose the layout you want to use for images appearance from Slider or Grid.
Choose the number of columns here for the grid display.
Space or gap between images. Eg: 10px
Bootstrap Column Class
It will use the bootstrap grid system
Check this option if you have images of different sizes
Check to enable the equal height of each column
Images in Slider
Images to show at a time in slider
Shortcodes in Caption
Check to enable shortcodes in the caption text box
Choose script to use for the popup
You can define your own styles here