Yes, it is possible to merge tags from the administrator interface. Only administrators and system animators have the permission to merge tags. You can replace one defined tag with another. The tag you specify will automatically be attached to the articles that were associated with the initial tag. Please note that the initial tag will be permanently deleted.
For detailed instructions, see our guide on how to merge tags.
For example: If I want to merge the 'knowledge plaza' tag with the 'Elium' tag, I click on the 'Merge' option next to the 'knowledge plaza' tag and specify the 'Elium' tag as the replacement.