phpMyAdmin - 错误：禁用关系功能

When I want to create a relation between two tables in designer mode with phpMyAdmin 4.3.8, it gives me an error saying: Error: relational features are disabled! When I try it with 4.1.4, it works just fine. I can't seem to find where I should change the settings to be able to create relations in designer mode. Any idea? Thanks in advance!When I want to create a relation between two ta