At times, we may need to make a global item as non-global on some specific page/post of the site.

Once you import the global item on a page, you can simply right-click on the module/row/section and click on the Disable Global option, as shown in the snapshot below:

Also, we can open the above settings by clicking on the three dots beside the delete icon:

Important Note: Please note that an item can be made non-global on specific pages only. We can not make a global element as non-global by directly making it non-global from the library.
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Also, we can't make the non-global item to global again that we changed. The item needs to be saved again as a global item which will be treated as a new global item.

Hope this helps!