I experiment an issue using dietpi 10.3.3 as when I select dietpi-drive_manager, no window/ui appears but the command is well launched as the ps command can show it.
I cannot even use ctrl-c to leave/exit and I must then kill the iTerm2 terminal from my mac access it.
You have probably set up a network share but it’s not reachable, but the script tries to reach it.
It should time out after some time and then the TUI will show up.