Mac Tahoe 26.1
FontBase 2.24.9
Can’t delete a font (or a selection of fonts) from a Collection. The only option is “Delete from Disk”. Screenshot attached.
thanks
Hello Steve, thank you for your post 
Simply click the desired font in the collection and drag your pointer - an area will appear on the right with a bin icon on it. Dropping the dragged font over that area will remove the font (or fonts, if you have more than one selected) from the collection.
Thank you again,