The Switch Quickbar keybind lets you toggle between builds in the Marvel Knockout : r/FortNiteBR
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Quickbar, Build Mode, Inventory, Emote, & Quick Chat do not show when ADS with Scoped Weapons Ex: Sniper Rifles, you can do all these with controller input : r/FortNiteMobile
Add this Mechanic to lock items in quickbar. : r/FortNiteMobile