How can I remove built in shelves?

The one shelf has door catches to keep the doors closed. Leave that one in place. The other shelves should be removable but not always. If they are fixed more likely they are either screwed or stapled to the sides. You can gently strike them from underneath with a hammer. Since they are particle board they will get damaged. You will need to replace them if they do. Then you can thin wood on the sides for shelf supports. You can also drilol holes for plastic or metal shelf brackets on the sides to really make shelves adjustable.

Here's an article that might help - https://www.hunker.com/12347959/how-to-remove-built-in-shelves

I agree with William, I would remove the shelving in there and toss it and start over with new wood, cut to correct size (measure before removing the old shelves) and use shelf supports. I would give the entire closet a fresh coat of paint and maybe even paint the new wooden shelves. I would measure exactly where the shelves are with the door catches and replace them on the new shelf. Good luck!

Hi, have you thought a out just adding a few more shelves and some boxes instead? It may make it easier for you

Had one bathroom with "9" people !!!!!:-( :-(

Cut them out as required or start again with your own shelving., or add brackets to take additional shelves or maybe pegs to take floating shelves?