Custom Brushes - Didn't Appear After Sync?

[JVGen]

I purchased a set of custom brushes (The Rusty Nib) from the affinity store and followed the installation guide.  I decided to login to my account to link my online purchases, and successfully installed the brush set.  However, when I navigate to Brushes, "The Rusty Nib" does not appear in the drop-down menu.  There are several other categories of brushes, such as Dry Media, Pens, etc, but I think these were included in the base version of Affinity Designer?  The Rusty Nib User Guide shows their brushes listed as several different option in the dropdown menu, all beginning with "The Rusty Nib - ...".  -See picture from the User Guide (I didn't link their User Guide because I'm not sure if it is intended only for those that have purchased the brush set).

Thanks for any help.

macOS BigSur 11.2.2

Affinity Designer Version 1.9.1

[R C-R]

If they are raster brushes, they will only appear in AD's Pixel Persona. 

[JVGen]

Thank you!  I honestly don't even know what Pixel Persona is, but I was able to find the brushes after switching to this "mode".