Hide "read next" in blog posts

Hi,
silly question: how can I hide the left column with "read next"?

You can use CSS to hide that part:

.item-page .siderbar-article .read-next {
    display: none;
}

add into one of these 2 files:
JROOT/templates/ja_spark/css/custom.css
JROOT/templates/ja_spark/local/css/custom.css

if none of them exist, you can simply create a file.

Regards,Heinz