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You can enter the name of the Icon in the Name attribute
e.g.
Name: account_info
(Refer the SLDS link)
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Size
Adjust Icon sizes using the size attribute with one of these values
There are five types of size
In the Size drop-down, select the size
XX-Small: You can set xx-small size on the icon
X -Small: You can set an x-small size on the icon
Small: You can set a small size on the icon
Medium: You can set medium size on the icon
Large: You can set the large size of the icon
e.g.
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You can enter a color in the Fill Color attribute (By using the Fill color you can customize the Icon color)
e.g, . The Icon is displayed in red if you enter that color
Fill color: Red
