Good afternoon, @andrea_earl ...
I'm not 100% sure of this, but I am not sure that specifying the start date of an announcement matters for Global Announcements???? The reason I say this is before my school closed for the holiday break, I had posted a couple global announcements (one of which was already posted a day or two earlier). If I recall correctly, the second of the two announcements I had posted I had set a start date prior to the start date of the first (because I wanted to try and make it appear above the first). But, that second announcement still displayed below the first one on the Canvas Dashboard. Since there's nothing in the current interface that lets you drag 'n drop announcements or position them in the order that you want, it may be a manual process of posting announcements in the order that you want.
As a side note, your posting seems to suggest that you have many announcements stored (but maybe not displayed) in Global Announcements. Have you considered creating a separate Canvas course shell to use as an "archive" for your past announcements? That's what we do, and I use it as a "go to" in case I ever want to bring back past announcements that I've posted to the Dashboard. That way, on your normal Global Announcements screen, you don't have so many announcements to look through. Just a thought for you to consider...
I hope this will help a bit. Let Community members know if you have any other questions about this...thanks!
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