Correct Answer:
View or change the compatibility level of a database
You can view or change the compatibility level of a database in SQL Server, Azure SQL Database, or Azure SQL Managed Instance by using SQL Server Management Studio or Transact-SQL.
Use SQL Server Management Studio
To view or change the compatibility level of a database using SQL Server Management Studio (SSMS) Step 1: Connect to the appropriate server or instance hosting your database [Here db1].
Step 2: Select the server name in Object Explorer.
Step 3: Expand Databases, and, depending on the database, either select a user database or expand System Databases and select a system database.
Step 4: Right-click the database, and then select Properties.
The Database Properties dialog box opens.
Step 5: In the Select a page pane, select Options.
The current compatibility level is displayed in the Compatibility level list box.
Step 6: To change the compatibility level, select a different option from the list [Select SQL Server 2012]
Reference:
https://learn.microsoft.com/en-us/sql/relational-databases/databases/view-or-change-the-compatibility-level-of-a-database