SQL server: can't save/change table design

If  you need to change settings to save the changes from design then you have follow below steps.

1. Open SQL Server Management Studio (SSMS).
2. On the Tools menu, click Options.
3. In the navigation pane of the Options window, click Designers.
4. Select or clear the Prevent saving changes that require the table re-creation check box, and then click OK.

Uncheck the prevent saving changes that require table re-creation.

!Thank you!