I want to set my main/featured image size on the product page to 450 pixels square. I’ve changed it under the Woocommerce > product image > main image width, but the image size doesn’t change. So my pictures are blurry as they are around 550 pixels square.
On the single product page, the main image will be half the width of the page container.
So, if you are using a wide ‘Container Width’ (see ‘Customize’ > ‘Layout Options’ > ‘Container Width’) then it may be that 450px is too small. We recommend using a main image width of around 900px or adjust the page container width to a smaller value if you don’t have large product images that you can use.