How to make the right previews?

Question

Java

How best to display image previews, now I display them simply on the button, but if there are a lot of images, they go to the bottom, overlapping the rest of the interface elements. In general, how and on what to display clickable previews?
To make it clearer, here is a piece of code that generates these previews:

void createImagesTileMap(AnchorPane pane){
        tileButtonWithImage = new ArrayList();
        double xImage = 10.0;
        double yImage = 10.0;
        for(int i = 0;i<buttonGetDirectory.getFileList().size();i++){
        ButtonWithImage button = new ButtonWithImage(pane,xImage,yImage,100.0,100.0,buttonGetDirectory.getFileList().get(i).toString());
        tileButtonWithImage.add(button);
        xImage+=130.0;
        if(xImage>600.0){
        xImage = 10.0;
        yImage+=130.0;
        }
        }
    }