Whether you have the normal RealVNC mirroring of your desktop you can create a virtual desktop (or multiple virtual desktops - if so inclined).
You can create a virtual desktop (on the Pi or via ssh) by running
This will produce something like:-
VNC(R) Server 6.3.2 (r39069) ARMv6 (Oct 17 2018 11:16:05)
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RealVNC and VNC are trademarks of RealVNC Ltd and are protected by trademark
registrations and/or pending trademark applications in the European Union,
United States of America and other jurisdictions.
Protected by UK patent 2481870; US patent 8760366; EU patent 2652951.
See https://www.realvnc.com for information on VNC.
For third party acknowledgements see:
OS: Linux 4.14.79 armv7l
On some distributions (in particular Red Hat), you may get a better experience
by running vncserver-virtual in conjunction with the system Xorg server, rather
than the old version built-in to Xvnc. More desktop environments and
applications will likely be compatible. For more information on this alternative
implementation, please see: https://www.realvnc.com/doclink/kb-546
Running applications in /etc/vnc/xstartup
VNC Server catchphrase: "⋯"
Log file is /home/pi/.vnc/MilliwaysPi3A:1.log
New desktop is MilliwaysPi3A:1 (10.1.1.2:1)
You can connect to this session in VNC Viewer using
10.1.1.2:5901 (obviously the hostname or IP will differ on your system)
PS The default virtual desktop may be unacceptably small. It is possible to specify size on the command line, or by setting the default resolution in