When using the one monitor on the laptop, I can't seen anything parked off the laptop monitor.
Oh, I know that feeling well. Nothing is so frustrating as being at the airport waiting for a long flight and the one project you need and forgot to take with you is sitting open in Manifold in the middle of some workflow on your machine back home. So, you fire up your laptop at the airport, trusting to super-fast airport WiFi (uh huh...), RDP into your machine and then you discover something is offscreen and RDP won't show it to you.
One way around that, in a case where you have a lot of windows open in your project and don't want to lose the spot in your workflow by closing windows or closing that Manifold session:
1. Save the project. Call it MyProject.
2. Save it again as MyProject1. This now frees up the saved MyProject.map file with no locks on it so you can copy it.
3. Launch a second Manifold session and choose File - Open.
4. In the first Manifold session, choose File - Save As.
5. In that File - Save As dialog, sort the files in that folder by the time modified so you can instantly see the savedMyProject.map. Copy it.
6. Switch to the second Manifold session where the File - Open dialog is still waiting open. Paste what you just copied. That also loads the file name into the box to open it. Press Open.
7. You've just opened MyProject in a second session, without disturbing the first session.
8. Switch to the first session where you can Cancel the File - Save As dialog.
9. You can now do what you want in that second session since as you open and undock windows, RDP will keep them in sight in your single monitor.
What's happened in the above is that those file lists and File Explorer-like dialogs that you see in the various File Save and File Open dialogs work just like Explorer. You can copy and paste in them.
When I'm working with multiple open Manifold sessions, I'll often use File Save As or File Open as a way of quickly saving to or opening from context folders. Since the Manifold sessions are pointed at the right folder I don't have to open a File Explorer window or navigate around to find folders from which particular files are being opened, linked to or saved. I just use the context that the various sessions are working in to take me there automatically.