Question can't know which graphics card is being used...help!

Jan 2, 2020
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Hello guys,
I am new here.
I recently bought a new gaming laptop.
Model - Acer Nitro 5 (AN515-43)
AMD - 3550H with Radeon Vega 8 (Integrated) and RX 560x (Dedicated).
I have seen online ( mostly on Youtube) that people are playing latest games on this exact same laptop with max\ultra settings, but sometime my game lags on these settings.
is it my graphics card setting, is it set to use integrated graphics or something else ? If it is then how can I make my games use my dedicated graphics card
Please help...!