Be neighborly. Say hello if you see people, don’t act weird. Obviously know the layout of the trails/ski runs and practice safe firearms handling.
Common courtesy is to not walk on groomed trails with boots or snowshoes. Even if it’s public land it would be the equivalent of the skier intentional routing themselves to go through your game to harass them off.
I haven’t encountered anyone hunting while cross country skiing, but while out running trails I can say often my best encounters are with people hunting or on horseback carrying a sidearm. We chat. Wish each other happy pursuits. It’s often other endurance sport people that will run me off the trail with their mountain bikes or plug in headphones with music so loud they can’t hear to step aside when I approach that irk me. My wife, a non hunter, has similar feelings.
That said, I would take it very differently if I saw someone pointing a rifle in my direction, so more than anything, keep it safe whether it’s skiers or too many other hunters out there in the woods with you.