Pre-allocate Space for Dbspace dialog

The Pre-allocate Space for Dbspace dialog has the following components:

How much space would you like to pre-allocate to the dbspace? Enter the amount of space you want to pre-allocate to the dbspace. Pre-allocating disk space for the dbspace extends the size of the corresponding database file by the amount of space you specify.

You cannot change the page size of a database because the page size is fixed when the database is created.