My fridge is full and I can’t store any more items.
When your fridge is full, you will have to serve, use, or sell some of the contents in order to make more room for new items.
Some ideas for clearing out space would be to click on the orders clipboard on the bottom right side of the screen and fill any orders that require fridge items, or to cook meals on your stoves that require fridge ingredients.
Another idea is to sell fridge items in the Market (Trading unlocks at level 7).
To access the market click the arrows icon on the bottom left hand side of your screen.
When you try to collect an item and your fridge is full, you will see a prompt asking you to upgrade your fridge.
Tapping the Upgrade Now button will show you the collectible items you need in order to increase your fridge’s capacity.