Why doesn't the toaster let me apply power to just one slot

The Long Slot Lite toaster has been designed with extra-long, 260mm slots to accommodate different varieties of bread and still ensure maximum browning coverage

Stainless Steel 4-Slice Long Toaster with Extra Wide Slot for Bread, Croissants, Buns, Reheat, Cancel and Defrost Functions, 6 Adjustable Settings · Salton -

long slot kitchenaid toaster Best overall: Breville A Bit More Long Slot Toaster — See at Crate and Barrel ; Best budget: DASH ClearView Long Slice Toaster — See at Amazon

long slot toaster reviews 2 SLICE SINGLE LONG SLOT TOASTER ; Description · Colour: Stainless Steel