Hard drive and storage size problem

sorry for my bad english
i just installed nextcloud on an ubuntu virtual machine with 1TB HDD Thick Provisioned, lazily zeroed type
After installation in setting i saw just 180GB free space and the hole hdd nextcloud used are 200GB
you can see my linux partitions in attachmented images

n1 n2

what is wrong?
why the hole storage didnt use?
what i have to do?