Board Thread:Support Requests - Getting Technical/@comment-32247874-20190425222517/@comment-9605025-20190429021258

You could also use CSS's background-size to control the size of the background. Also, you don't technically have to upload the image to your wiki as long as it is somewhere online. However, uploading a copy to the wiki is considered a best practice.

No, there is no "mark as not read" feature. However, if you don't get many notifications, it may still be at the bottom of your list (grayed-out).