You can get the Magnifying Glass tool 🔍 as a reward or purchase it while searching a scene. It especially comes in handy in difficult search modes. It might be best to use the Magnifying Glass when there are just a couple items left to find in a scene.

Tap the Magnifying Glass icon in the bottom right corner of the screen while in the hidden object mode to activate it. Once activated, the Magnifying Glass will light up one random item in the scene.