Changes need to be done in the palette .
In the Bowl setting window (bottom of screen), right hand top is the palette selection button. It indicates what palette is being used for the bowl view.
To change the ring 1 wood species, , go to the top of the screen, select palette.
This lists all the palettes that have been built/saved in SP. Go to the one that you are using for the project you are working on.
Ring 1 is the disk. Double click the wood species in column 2 on the name row for the palette you are using. and then select what wood species you would like.
Palette, column 1 default is the default wood species for ring 2 and up.
Palette, column 2 is for ring 1 (SP default is a disk).