Just a quick test of the “Suppress this category from the homepage” setting.
Idea is that you can play in sandbox without posts appearing on home page.
Doesn’t show on home page for me, but I drop straight into the Latest Posts page as default anyway (It shows there).
Not an issue for me anyway as the Sandbox isn’t the busiest of subforums
Another member wants to have a play without polluting the home page and asked me about it. And what do you know… there was already a setting I can use for that 
Actually, reversed the setting as it means the whole category is hidden from home page so users won’t be able to find it.