Disk space was disappeared after removing bootcamp partition

MacBook Pro (Retina, 15-inch, Mid 2015), 512Gb, High Sierra 10.13.3

I removed bootcamp partition. And now I have only the one Macintosh HD partition. The volume of this partition is less then volume of ssd disk by the volume of bootcamp partition which i removed. And I cant find that space. And I cant extend Macintosh HD partition.

The volume of ssd disk is 512Gb (available 500Gb). The volume of my main partition Macintosh HD is 444Gb. Bootcamp partition volume was about 48Gb.

How can i find that lost space? Thnx!