i missclick import demo in store configuration and mess up everything..how to fixed it back..user interface mess up
Which "import demo" button? Can you share an screenshot?
If the changes were at database configuration I guess the only way to resotre those values is having a backup.
If not, you should edit every modified configuration.
i just missclick demo and not even click save config button but the change still take place..i already fix it by using hosting backup service..still dun understand that demo function
That isn't an out-of-the-fox feature of Magento.
I don't know the vendor but it seems they sell themes and modules so you could try to ask for support. I don't know which changes that module can do to the main configuration.
If you don't have a database backup, I'm not sure how to help.
The best idea would be to ask for support to the vendor.