I think updating the help center is a good start but I would also like to recommend that we overhaul the entire process - the close reason wording isn't bad but when we improved the close UI and the post notices, we added the ability to customize the text based on who sees it, which means that a close reason can now have five separate targeted notes for different groups of users.
What this means is that we can customize five different pieces of text to better help close voters know when to use that close reason, askers to know what to do when their question is closed, and people with the close privilege to know how they can help improve the question or guide the asker to improve it.
Here's the five fields and examples of what they could say for this specific close reason - they have a 500 character limit with the exception of the first:
- Brief description (100 characters but should be just a few words) - this is the Bold part of the close reason that appears in the close vote UI when closers are voting to close the post. It's the equivalent of "Needs more focus". For this, you could use -
Relates to only one site
- Usage guidance - this tells close voters when to use this close reason. It should clarify any edge cases and help voters feel certain they're choosing the correct reason So, you could put something like:
This question should have been posted on a child meta rather than on Meta Stack Exchange because it relates to only one site. In some cases, it may be worth flagging for migration instead or in addition to closing. Consider leaving a comment pointing the asker to the appropriate meta site. If the question relates to the broader network despite being focused on events that occured on one site, do not close the question with this reason.
- Post notice close description - visible to all users. This is a general note about why the question was closed. It can include links to resources that explain the site's policy. It should always start and end with the same thing "This question was closed because it is ... It is not currently accepting answers." An example might be:
This question was closed because it is about an issue related to a single site on the Stack Exchange Network. It is not currently accepting answers.
- Post owner guidance - this additional information appears in the post notice but only for the asker of the question. It should contain detailed information about how they can improve their post and may also include links to help here on meta or in the help center. For example:
Your question relates to one site only and should have been asked on that site's meta. To find the meta site for any network site, visit the main site and use the right hamburger menu to find the meta associated with that site. You may also flag this question for migration but it may be faster to delete the question here and repost it on the appropriate meta site. If you believe it should be on MSE, edit the question to explain how this relates to the whole network.
- Privileged user guidance - this additional information appears in the post notice but only for users with the close/reopen privilege. It is designed to help them know how to guide the asker in improving their question or inform them when the question should be reopened. You might say something like:
If you believe the question relates to the entire network, help by editing the question to improve it or leave a comment guiding the asker in how they could improve their question. If you believe this question should be migrated, please flag for moderator attention and ask them to migrate it.
Those are... very rough first drafts and none of them include links to helpful resources - which can often be useful to closers or askers whose questions are closed y'all may even want to create more specific guidance specifically for the purpose of explaining the process in more detail - but that's up to y'all.
If you'd like to do this for the four site-specific reasons here on MSE, workshop the five fields for each (probably one meta discussion for each close reason) and, once you're happy with the result, get a mod to status-review the post so that a CM can review the text and edit the existing close reasons.
If you think the change to the close reasons is major enough, it may also be better to retire the existing ones and start with new reasons entirely, which just requires two moderators, no CMs. In general, we have avoided editing the close reasons in preference of creating new ones unless the change was a minor one, such as fixing a typo or a link. The reason for this being that editing the close reason retroactively applies the new text to old posts - if you do this with a completely new close reason, it can leave confusion at why an old post was closed with the new reason - it's just safer to go this route. But if the guidance and instructions are largely the same, editing the existing reasons is possible - it just requires a CM.
As a note - all of this is possible for any site. I've already helped Academia and Stack Overflow go through this process for their sites and Sci-fi & Fantasy and Electrical Engineering are currently going through it - so if you see this and wonder if your site could do the same - you can. Feel free to steal the explanation above for each of the fields.