Saving changes after table edit in SQL Server Management Studio

Solution 1:

Go into Tools -> Options -> Designers-> Uncheck "Prevent saving changes that require table re-creation". Voila.

That happens because sometimes it is necessary to drop and recreate a table in order to change something. This can take a while, since all data must be copied to a temp table and then re-inserted in the new table. Since SQL Server by default doesn't trust you, you need to say "OK, I know what I'm doing, now let me do my work."

Solution 2:

Tools | Options | Designers | Table and Database Designers

Uncheck the option "Prevent saving changes that require table re-creation".