so, it's easy to create custom color Palettes in Affinity Designer, but I have some problems to change colors in complex layouts - maybe there is a way I don't know ...
So, it would be very cool I you have the option to Name a color, maybe as "Background" and one as "foreground"
background = white
foreground = black
For every color I can choose I'm able to define - this is my foreground color, this is my background color or whatever.
Now if I change the color defined as foreground from black to green, every Element with this color changes to green - indepe