Thanks for ping @Daniyal-Ahmed With all the things going on, I don’t get to read every single post like I used to.
@fourteen You are looking for line 4615 of the app.css which is pictured below

Add that to a theme/snippet and change the color like this:
.graph-view.color-fill-focused {
color: red;
}
And you change the selected node to your desired color:
