Add borders for outlining, highlighting and encapsulating cells
This rule is used to add lines between cells in a Visual Grid for style, emphasis, separation and visual distinction. Borders are a good way to make certain parts of your chart stand out with a clean look.
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Properties

Color - Choose the color of the border
Thickness - Adjust the thickness of the border
Dash type - Choose how the line itself will look, continuous or dashes/dots
Border - Choose how the border will wrap around the object you've chosen. Clicking the lines will enable the border for that part of the object.