You may use the whole volume group for guided partitioning, or part of it. If you use only part of it, or if you add more disks later, then you will be able to grow logical volumes later using the LVM tools, so using a smaller part of the volume group at installation time may offer more flexibility.
Ahat ilaq ad tesqedceḍ agraw n yiblaɣen s lekmal, neɣ aḥrec seg-s. Ma yella tesqedceḍ aḥric kan seg-s, neɣ ma yella terniḍ aṭas n yiḍebsiyen mbeεd, ad tizmireḍ ad tesnerniḍ iblaɣen imeẓẓulen send aseqdec n yifecka LVM, ihi aseqdec n uḥric mecṭuḥen aṭas seg ugraw n yiblaɣen lawan n usebded yezmer ad d-imudd ugar n tfallaẓt.