Glad that the tutorial is helpful.
The display of the arrow will depend on two things:
– how many colors there are in that particular palette; notice that when I showed the Pastel palette, there was no arrow because all the colors were already displayed. By the way, the Festival of colors palette includes 36 colors, which is exactly what you have 🙂
– how high your Materials palette is; sometimes, you might have another palette below that overlaps the Materials palette. If that is the case, you have to grab the top of the palette below and adjust its height.
Personally, I wish there was a scroll bar instead, to be consistent with everything else in PSP and to address that possibility that another palette might overlap that little arrow, but I still have to live with it.
Does that help?