Please add information about OS/platform and Inkscape version.
> there is an option to change the color palette size, but
> I cannot find it. Where is it?
The basic size of the palette depends on the current GTK+ theme. Within Inkscape you can change various parameters of the palette from the palette menu: left-click on the small triangle at the right end of the palette -> see sub-menus 'Size', 'Width' and the toggle 'Wrap', at the top of the menu (above the list of installed color palettes).
Please add information about OS/platform and Inkscape version.
> there is an option to change the color palette size, but
> I cannot find it. Where is it?
The basic size of the palette depends on the current GTK+ theme. Within Inkscape you can change various parameters of the palette from the palette menu: left-click on the small triangle at the right end of the palette -> see sub-menus 'Size', 'Width' and the toggle 'Wrap', at the top of the menu (above the list of installed color palettes).