Question While gaming, my laptop uses battery power even though it's plugged in ?

Mar 8, 2022
I have a Asus Tuf FX505GD gaming laptop with 16GB RAM and a GTX 1050 4GB. I bought it a year ago.

When I play games like GTA V, Far Cry 6 etc. even if I plugged in, it still use the battery.
I know this because after a full charge in plugged in mode while playing games, the battery goes down significantly.

Any solution ?
I couldn't figure it out myself.
Please help !