How to exclude posts from child categories when searching the parent category

I run a blog that has over 3,000 articles. Before I took over, some of the previous authors did not always put posts in the correct categories.
There is a parent category called ‘News’. It has about 10 child categories such as Tablets, Computers, Gaming etc. However, some posts were just placed in News rather than the correct sub-category.

I wish to edit these, but have found there is no easy way to do this. When I search the News category, it shows all posts within that, including the child-category posts. Is there a way I can search for posts just placed in the News category and nothing else?