Set which renderings are allowed in a placeholder
You can use placeholder settings to restrict the renderings that can be added to placeholders. If you are using placeholder settings and you create a new rendering, you must update the settings for placeholders where you want to use the new rendering.
To allow renderings for a placeholder:
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In the Content Editor, in the sitecore/Layout/Placeholder Settings folder, select the placeholder where you want to use the new rendering.
For example, select the content placeholder that is installed with Sitecore by default.
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In the Data section, in the Allowed Controls field, click Edit.
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In the Select Items dialog, use the double-arrows to move each rendering that you want to allow into the right pane.
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Click OK and save the item.