I want to include a narrative of sorts, to describe my initial configuration. I'll do that here, because it doesn't seem appropriate to make it a bug report. Here's how it went.
The bottom panel, as I mentioned, is different from my Xfce VMs that were created from Budgie VMs, but I wanted to keep this UI looking like what the users will see. So there's a bottom panel, on which I installed a workspace switcher and in the settings, I raised the number of workspaces from the default 4 to 9, and named them, to accommodate the apps I'm testing with.
From left to right, those are Email, Browser, Spider, Shisen-sho, Mahjongg, Telegram, System, File Manager, and Terminal. The only thing I would change about the workspace switcher is to change the color of an empty workspace that's been selected. Most other workspace switchers I've used do that, to confirm which one will be used to start an application.
In the terminal, I did an update, then installed the software I'd need to do the testing. That included Terminology, Vivaldi, Restic, and Micro. I used micro to modify the two .bashrc ffiles to include my additions, and to install my NAS shares in /etc/fstab. Then I created mount points in /mnt, and mounted those shares there. Back in my /home folder, I deleted all the folders except Desktop, and replaced them with symlinks to those mounted shares.
I really like Thunar. There was absolutely no drama involved in any of this configuration. Well, except for one thing. I've been unable to find a setting to change the double-click to open an item to a single-click. I'm sure it must be in there somewhere, and I'll probably find it as I refine this configuration.
Right now, though, it's time for breakfast. If I have any reason to, I'll comment further in this thread, but I suspectt that won't be necessary. By the way, I've created this post entirely in the Xfce 4.5 VM. I really like the Xfce Screenshot utility, too. And a general impression of the performance is that it's much "snappier" that I would have expected for a release candidate.