Does HDR need to be enabled in KDE for it to work properly in games?

May be a dumb question, but do I need to enable HDR in the KDE Display Configuration in order for it to work properly in games?

I'm using PROTON_ENABLE_WAYLAND=1 PROTON_ENABLE_HDR=1 in Cyberpunk so that I can enable HDR.

The HDR toggle appears in game whether or not I activated HDR in KDE, but I swear that the picture looks different depending on if I've enabled in it KDE. Being pretty new to HDR, I can't tell which is the "right" one.