Default 500 ?
Using Jamroom
Yes, it would remove it everywhere. sorry I thought that was the goal. If the goal is to put everything into a category, then unless im missing something again, click on the DEFAULT:500 and get a list of all those blog posts
https://americymru.net/ceri-shaw/blog/category/default
Then update them so they have a category.
--edit--
Could be a good use-case for the BATCH ITEM EDITOR. search for all the blog posts with the category DEFAULT and change it to what you want.
updated by @michael: 07/31/17 09:54:58PM