You can set watermark settings in the "Look and feel" section of the Confluence space settings.
Go to the "Look and Feel" Settings page and click on "Watermark Settings" to go to the Space Watermark Settings page:
This space inherits the global watermark settings when the "Use Global Settings" button is turned on.
When the "Use Global Settings" button is closed, the watermark settings for this space are followed. (This button is not operational if "Use global settings for all spaces" in global watermark settings is not working)
Compared to the global watermark setting, two options named "space Logo" and "space name" are added to the space watermark settings for the Content, and a one-click switch for the "Enable watermark features" is added to the Options.
Meanwhile, click "reset" to reset the Content and Options of the space to be consistent with the global settings.