When I right click a file (or folder) and select "move to," I get the message that "folder content can not be displayed."

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Does this happen with all directories/files?
If not, with what directory/file location does it happen? In your user /home directory? Else where on the filesystem? On another partition or another drive? What filesystem is on the location you are trying to access?

It only happens with the user/home directory when I highlight the file/folder and right click to select "move to"
It's not really a big deal, but it use to work properly in previous versions of Ubuntu

Just a note that, for anyone searching for a solution to this, I think the exact error message should be "The folder contents could not be displayed".

Although specific to Solus, the following bug report claims that the issue is no longer reproducible in Nautilus 3.28.

https://bugzilla.gnome.org/show_bug.cgi?id=777201

Which version of Nautilus are you using?

What do I type into terminal to find this out?

update:
michael@michael-HP-Pavilion-Notebook:~$ nautilus --version
GNOME nautilus 3.26.3

Various options, but the following one should do the trick:

michael@michael-HP-Pavilion-Notebook:~$ nautilus --version
GNOME nautilus 3.26.3

Ok, thanks. So one solution would be to install Nautilus 3.28 on your Ubuntu 18.04 system.

Except, here's the rub. It appears that Canonical intentionally held Nautilus back to 3.26 because the Nautilus developers have made it that 3.28 does not support icons on the desktop at all.

Please read more here: https://didrocks.fr/2018/01/23/welco...desktop-icons/

So you have a choice. Stick with what you've got for the life of Ubuntu LTS; upgrade Nautilus to 3.28 (if you are able but I'm sure that there will be a way); use another file manager e.g. Caja/Thunar etc. (if this can integrate properly into Ubuntu GNOME); or switch to another desktop environment that sticks more to the standard desktop paradigm, e.g. Ubuntu MATE.

Your call.