Well, it relates to the images per album and depends on the "Number of items in album card " parameter in the settings of Albums app. But the number of items are controlled by Flickity options , you may add / change more parameters in the following code of modules\boonex\albums\js\main.js file:

BxAlbumsMain.prototype.init = function() {

    $('.bx-albums-unit-images').flickity({

        cellSelector: '.bx-albums-unit-image',

        cellAlign: 'center',

        imagesLoaded: true,

        wrapAround: true,

        pageDots: false

    });

};