Fallout 4, tag for research, items appearing green

I've been playing Fallout 4 a lot since the day of release, I have been having no issues and have been going through the game fine, until today.

I think I did something to make all the items I had tagged for research to be highlighted in green. I would like to change it back to just the magnifying glass but I don't know how.

I'm playing on PC, any help will be appreciated.

The highlighting is part of the Scrapper perk, so there is no way to get rid of it once you have the perk. All it does is highlight items so you aren't losing out on anything.

From your comment it seems you are confused about it's functionality. Highlighting a certain resource like leather or copper won't stop you from getting other components when breaking down an item. Say you highlighted leather, a teddy bear breaks down into leather and 3 cloth everytime you destroy one. Highlighting one component doesn't stop you from collecting the other ones.