Toggling a symbol off via the legend causes the other symbols to flicker off and back on.
Desktop Chrome (I imagine this applies to all devices/browsers though)
Go to the map for 1.2 Kespukwitk / Southwest Nova Scotia (or any other one). Toggle off a symbol that is not Kespukwitk / Southwest Nova Scotia e.g. "Mixed Grass Prairie". Notice the symbol for Kespukwitk / Southwest Nova Scotia flicker off and back on after a second or so.
From @mohsin-r: