This articles does not cover Posts generally, so please read that articles for more context. This article only covers the specific Issues List block and it's design options.
The Issues List block is used to display issue "posts". Posts are a specific type of content that can populate other blocks, and can be filtered by tags and more. We have other blocks that use the word "priorities" that also are intended for issue related content, but do not use the Posts feature, so those might be useful to look at as well, depending on your needs.
Issues List display options
You can filter what issues are shown by applying tags to the specific Issues List block you're working in and applying those tags to the individual issues you'd like to show up there.
You can apply an icon to each issue by clicking the image icon on the drag block on the sidebar for that issue.
If you don't want to show the View More buttons on the issues, that's controlled through the Post Publishing Setting.

