why a fresh ESXI installation only uses half of my SSD storage?
Solution 1:
ESXi 7.0 installation may take up to ~138GB. Proof - https://williamlam.com/2020/05/changing-the-default-size-of-the-esx-osdata-volume-in-esxi-7-0.html
You see 110GB space available for VMs datastore. It is an expected behavior.