When importing content from another course, if you choose copy entire course there should be a pop up asking if you're sure you want to copy everything.
I realize this is my mistake and I should've looked more closely, but I've lost a few hours I'll never get back cleaning everything up.
Thanks for sharing this idea, and it is awful that that happened to you. As this idea moves forward for broader discussion, you might be interested in checking out this related conversation: Import Course Content should always be non-destructive
Thank you. Fortunately I was importing into a new course and had only done a little work. I made a few mistakes deleting everything and had to fix that, but it wasn't as bad as it could've been. Thanks for sharing the other conversation. I like that idea as well.
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