When you design a table in a database and then try to make a change to a table structure that requires the table to be recreated, the Database Management Studio will not allow you to save the changes. This is caused by a configuration setting that results in the following dialog:

This dialog states: “Saving changes is not permitted. The changes you have made require the following tables to be dropped and re-created. You have either made changes to a table that can’t be re-created or enabled the option Prevent saving changes that require the table to be re-created.”

You can only react by clicking the Cancel button. And then Management Studio shows this dialog:

So what do you want to do to configure the setting with the value you want (should be the default setting!)?