Enable this feature with the button at the top of the tab
If you have different stores for different regions, you can take advantage of this feature.
NOTE: Be careful of redirect loops. Don't redirect back to the same store
If a valid value is entered in this field for a region, it will take precedence over all other settings for that region. No product redirects, blocks or any other settings will be processed for those visitors and they will be immediately redirected to their respective entered URLs.
If a region is left blank, visitors from countries in that region will not be affected by this setting.
Click Save Multi-Store Configuration when you are happy with your entries.