Thanks for trying linux!
I don't use pop os or gnome personally and I'm not part of any cult or whatever.
I found a accessibility setting that changes stuff to be white but I don't think I got what you wanted 🥀
I know kde plasma has a white general look, and can be themed much more than gnome in pop os seems to be.
it also has 3 finger click in its setting under the touchpad option
Also, try Fedora 39 kde spin https://fedoraproject.org/spins/kde/ I mention this because fedora has the new linux tech in it so your laptop might behave better with this os.