Linear/Radial Gradient
I wish to know in the stroke option Linear/Radial Gradient will only show in black and white colour.

I wish to know in the stroke option Linear/Radial Gradient will only show in black and white colour.

The icons only show what kind of gradient you wish to apply. After applying a gradient, you double-click the color in the Toolbar or in the Shape/Gradient Fill property of the timeline to edit the colors.
Type "shape layer" in the Search Help field in the top right corner of After Effects for detailed instructions on working with Shape Layers.
You should probably also spend some time with the User Guide and in the Learn workspace.
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