A COLR color font carries one or more palettes that map a small set of named slots (palette entries) to colors. Each color glyph member references a palette entry rather than a literal color, so an entire font's color scheme can be re-skinned simply by changing the palette — without touching any glyph data.
Assigning a Color to a Member
In Color Mode, pick the Paint Bucket tool 
from the Drawing Toolbar and click a color glyph member to fill it with the active palette entry. Choose a different active entry by clicking it in the Palette panel (Windows) or by right-clicking the bucket tool to open the swatch picker (macOS).
Editing Colors
Palette colors are global. Changing an entry updates every member that references it — useful when re-skinning, but worth keeping in mind when only one member should change. To give a member its own color, add a new palette entry first and assign that.
In the Masters and Layers panel, the color column on each color-member row is click-to-edit: clicking opens a compact palette-entry picker so the member can be reassigned without leaving the panel.
Palette Manager
On macOS the Palette Manager dialog is the primary surface for authoring palettes (adding, removing, and editing palette colors and the foreground / background sentinels). Open it from Tools → Palette Manager, or by Shift-clicking the bucket tool. On Windows the docked Palette panel covers the same workflow inline.
For more on color font support across browsers and tools, see the online FontCreator color tutorial.
See also:
