The Colors tab controls selection of the current colour scheme in use in the document. The default is 'Modern'. The list shows both built-in scheme and any stored in the Tinderbox support folders. Read more on colour scheme files.
The left list box lists available scheme. When selected, a sample bitmap (if supplied) illustrating the scheme is displayed on the right.
Note that from v8.0 , Tinderbox's colour schemes have been given an overhaul. In support of these improvements, old colour schemes have been dropped. This means new documents will have a different set of pre-defined colour schemes: are Coral, Dark Coral, Franchi, Green, Solarized, Sorolla, Standard, Storyspace, and Modern. 'Modern' is now the default (replacing 'Standard')
The colour scheme format has been extended to accommodate a wider range of appearances. Experimental support has been added for colour schemes that use dark background colours, in part to determine how difficult this may prove. Tinderbox has always assumed that map and text panes had fairly light backgrounds, but there has clearly some interest in dark colour schemes, especially since the macOS 10.14 introduced a dark mode.
In the Modern colour scheme, the map background colour, and the colours 0-9, are slightly bluer.
When applying a new colour scheme, if the scheme changes $TextFont, notes that use the old text font will be changed to use the scheme's text font.