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Have a read up on this: Mapping Architecture - Tableau Mapping -
Changing Label Attributes
Label layers are used to place labels on geometries. Labels have a number of formatting elements that can be changed by the user:
mode=label: specifies this as a label layer
from: the geometry table that is being labeled
select: specifies the column of data where the label text is defined. If omitted, Mapfluence uses the default or ‘name’ column.
wrap_width: maximum label width
face_name: font used; learn about available fonts
fill: font color. Mapfluence recognizes many common color names, including red, blue, maroon, white, black or transparent, or you can specify a hex color code.
size: font size
halo_radius: size of “glow" around fonts that separate them from background map
halo_fill: color of halo
Note: Certain labels that come out-of-the-box from Tableau are pre-rendered and therefore have limited formatting options. You can change the opacity of labels for Countries, States/Provinces, Counties, and Place Names, but not the color or size.
More details and additional formatting options for Label layers can be found in Urban Mapping's Developer Documentation - Label Layer