DNN 9 doesn't have a nice UI 😟 so you'll need to use some SQL
- Go to the System Settings > SQL Console
- Run the following script
- Afterwards, restart DNN to load the setting you just changed
The Script
UPDATE PortalSettings SET SettingValue = 'False'
WHERE (SettingName = 'EnablePopUps')
And PortalId = 0
Change the PortalID to your PortalID, or remove the AND line to set it for all portals