Table prefix allows you to easily make a distinction between tables converted using Full Convert and ones already existing in the target database.
Name casing will change table and column name case on the fly. Please note that default is different than Unchanged. Default means whatever is default for current target database that doesn't require me to quote names when querying. Unchanged means "force names to stay exactly the same". In Unchanged mode, if you have table name called "EmployeeHistory", we will preserve upper- and lower-cased letters - but you will probably need to quote such names when querying the data.
You can skip index and foreign key creation.
If you work for long time in the open application and there is a chance that someone else (or you) had changed source database structure while project is open, force Full Convert to reread database structure whenever conversion is run, instead of only when project is opened.