Adobe Portfolio

Hope this finds the right category. I'm building my own websit via portfolio using the theme 'Andreas', I want to create more than one gallery to show images, when I click on collections to add a photo gallery (photo grid) using collections it shows a large image with a box either on left or right side with text (container)?. Clicking on that opens a gallery.

However, I just want small thumbnails to open to a gallery, can anyone advise please how this can be done.

Many thanks