You can choose a Minimal Installation by de-selecting everything in the Package Group Selection screen, see “Paket Grubu Seçimi”.
Minimal Installation is intended for those with specific uses in mind for their Mageia, such as a server or a specialised workstation. You will probably use this option combined with Manual Package Selection, see “Paketleri Tek Tek Seçin”.
If you choose this installation class, then the related screen will offer you a few useful extras to install, such as documentation and X.