Help please to sort out two /home directories!

I have messed up while doing a new installation of 12.2 and now have two /home directories, one in the correct place but only holding trashed directory (which I need to restore) and one holding everything else, including an empty directory /multimedia.

Here is the partitioning:-

IBMx3400:~ # parted -l
Model: ServeRA Drive 1 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  21.5GB  21.5GB  primary   ext4            type=83
 2      21.5GB  45.1GB  23.6GB  primary   ext4            boot, type=83
 3      45.1GB  70.9GB  25.8GB  primary   ext4            type=83
 4      70.9GB  1000GB  929GB   extended                  lba, type=0f
 5      70.9GB  996GB   926GB   logical   ext4            type=83
 6      996GB   1000GB  3470MB  logical   linux-swap(v1)  type=82

Model: ServeRA Drive 2 (scsi)
Disk /dev/sdb: 3000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt_sync_mbr

Number  Start   End     Size    File system  Name     Flags
 1      1049kB  3000GB  3000GB  ext4         primary

The Drive 2 holds a directory if I look at it using the Yast partitioner:-


I have no idea how this came to pass but it was my intention that within my home tree /home/alastair/ the directory mastermedia on Drive 2 should be mounted and this was what prevailed before my new installation.

I have mastermedia content backed up so what I would like to do is get rid of the /home/.Trash-0/files/alastair1/mastermedia entry and just restore my original arrangement with my /multimedia directory stored on Drive 2 but of course appearing within my home directory tree /home/alastair/

I hope all that is clear and hope somebody will put me right.

Using advice previously given I have grasped the nettle and used the Yast partitioner to edit the mount point. Seems to be OK now so assume fixed until I get stuck once more.
Please forgive first entry.