Install not using whole disk

[David]

Folks

I am trying to install the "live server" of 22.04 onto a 200 GB 
drive.  I have selected the following options
   Use Entire Disk
   Set up this disk as an LVM grup
and used pretty much the defaults from then on.  After the install, I 
find most of the 200 GB drive unused.  The 'lsblk' command reveals 
three partitions:
  sda1 size 1m
  sda2 size 2G mounted on /boot
  sda3 size 198g
   ubuntu--vg-ubuntu--lv size 99G (lvm) mounted on /

If I read this correctly, I have a partition of size 198G of which 
only 1/2 (99G) is used by the Logical Volume.  Indeed, if I start 
moving data onto the drive, it fills up after the 99G limit.  What 
happened to the "Use Entire Disk" option?  Do I need to do something 
to start using this extra space?

Thanks for your help

David