In the dashboard, go to gallery styling.
Change the gap between the pictures.
Change the edges on each picture.
Change the picture aspect ratio. One(1) in aspect ratio give square pictures.
Slider grid size
Change the number of pictures visual in the slider without scrolling.
Tip: Use half pictures, e.g. 3.5, to encourage scrolling.
Feed grid size
Change the number of pictures per row in the Feed