I am using Ultimo theme. Does anyone know how to increase the related products slider image size on the product page in magento 2?
You can change product image size from here:
As per default Magento You can edit following code to change image size for Related Products in your view.xml
<image id="related_products_list" type="small_image"> <width>340</width> <height>450</height> </image>
Find image id which is used for Related Products image.
Please don't forget to clear cache after change.