1. Select cell A1.
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2. On the Home tab, in the Styles group, click Conditional Formatting.
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3. Click Manage Rules.
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The Conditional Formatting Rules Manager appears.
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Note: because we selected cell A1, Excel shows the rule applied to the range A1:A10.
4. From the drop-down list, change Current Selection to This Worksheet, to view all conditional formatting rules in this worksheet.
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Note: click New Rule, Edit Rule and Delete Rule to create, edit and delete rules..