Hi,
Edit your menu item via the Joomla menu manager and turn off the "filters" display setting under the "product options" tab to remove the filters from the top of the listing.
Instead, enable and configure the HikaShop filter module via the Joomla modules manager so that it displays your filters on the left side of the page.
You can create a filter of the type "cursor" applying on "prices" to get that price filtering on the filter module.
And if you want to change the size of the images, you could edit these images with your image editing software (paint, photoshop, paint.net, gimp, etc), reduce them and reupload them on your website.