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Under Visibility settings > Pages > Show block on specific pages, select which pages you wish to add the block to or exclude the block from
All pages except those listed
Only the listed pages, the example image below will make the block appear on the students page, and all the pages under the students area
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Under Visibility settings > Pages > Show block for specific content types, you can select content types and your block will appear on any page that uses that given type. Selecting no types, means there will not be a specific type limitation.
Click Save block
Test your block implementation on pages you intended your block to appear on and make sure they are not appearing on those you don’t. See the section Configure Existing Block below to make adjustments
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Configure Existing Block
Go to Structure > Blocks
Scroll down to your block
Click the configure link under the Operations column
Make your changes adhering to the Create a New Block steps above
Click Save block
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