All you need to do is edit your servers php.ini file and increase the memory size. If there isn’t one then you can make one and stick it anywhere you need it. Home directory obviously will cover entire site.
Flush the theme’s cache. I would think you could edit the css to have it display none. I am working on this as well because I do not want it showing up at all yet it does.
What I did was open E commerce’s image folder and replace the images with the one’s I wanted making sure to keep names and extensions the same. I actually went and edited the php file so I could switched image extensions.