Since update windows 10 to update 1803, recovery partition shown up as drive D on my Desktop.
Here how to hide it
-run cmd as Administrator
> diskpart
DISKPART> list vol
Volume ### Ltr Label Fs Type Size Status Info
———- — ———– —– ———- ——- ——— ——–
Volume 0 E DVD-ROM 0 B No Media
Volume 1 D NTFS Partition 450 MB Healthy
Volume 2 C NTFS Partition 1862 GB Healthy Boot
Volume 3 FAT32 Partition 100 MB Healthy System
DISKPART> select vol 1
Volume 1 is the selected volume.
DISKPART> remove letter=d
DiskPart successfully removed the drive letter or mount point.