In your collection you can find the frames and figurines that you have obtained so far, in addition to viewing the collectibles that are still locked.
You can access it by clicking on the suitcase icon on the bottom right side of the lower options bar.
Remember that for the item won to be enabled in your collection, it is necessary that you first claim it from the "Goals" section, in the "Themed" section.
For more information about collectible items, we recommend visiting the articles What are frames? and What are figurines?