First phase of conversion is creation of tables in the target database.
Each database engine has its limitations and Full Convert will take that into account. Target names will be shortened if needed and deduplicated. For example, Oracle allows only 30 characters for table and column names. SQL Server allows 128 characters - so copying SQL Server to Oracle will often require us to clip names and apply deduplication.
Please note that you are free to change the way tables from source database are mapped to target using table mapping screen. See Automatic mapping and Manual mapping to learn more. You can open it by clicking Edit from Overview screen, after showing list of tables in the project using Show tables button. You can even change schema mapping in the Mapping screen.