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I use a Lenovo ThinkCentre M920z, Intel Core i5-8400, 8GB ram with 128 GB Toshiba KBG30ZMT storage, using Intel UHD Graphics 630 27.20.100.9030. Os is Windows 10 Enterprise 21H2 64 bit 19044.1889.
The integrated display is Display 1. I have a Dell UP3017 monitor connected to the HDCP port as Display 2. And a Samsung UN32EH-5300 32 inch television connected by HDMI to a j5Create JUA254-4A USB to HDMI adapter as Display 3.
They are arranged left to right in display settings as Display 2 - 1 - 3.
I have set Display 1 as "Make this my main display".
I connect using Remote Desktop Connection either through Zscaler vpn directly from my home, or by logging into a Citrix server, then Remote Desktop Connection to this PC.
When I connect remotely, I display the remote desktop (one screen) full screen on a 4K Vizio Television. I reboot the Lenovo when I disconnect.
My problem is that when I log into the computer in the office, the taskbar, and the "main screen" icons appear on Display 3, the Samsung. When I bring up the display settings, "Make this my main display" is checked for Display 1. To fix this, I have to select Display 3, check "Make this my main display", the screen flashes and keeps the taskbar on Display 3. Then I have to select Display 1, check "Make this my main display", and the taskbar and the icons move to Display 1.
If I reboot and log into the PC, Display 1 remains the main display. If I connect by remote desktop, then log in at the physical workstation, the main display changes to Display 3.
How do I stop this behavior and keep the main display set as Display 1 after Remote Desktop Connections, and why does Settings not indicate that the main display has changed?
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I have exactly the same issue (Dell Precision T7610; Windows 10 Pro, v10.0.19044 Build 19044).
I have a dual monitor setup and my preference is to have the left-hand display as the main display, with full detail shown on taskbar. The right-hand display should show icons only (this helps with privacy / data security when screen sharing as filenames etc. are then not shown).
A login from remote desktop will set the right-hand display to be the main display (with main taskbar showing full details). When I open the display settings, it shows the LH display to be the main one, and to fix it I have to make the RH display the main one (screen flashes and then nothing is changed), then reset the LH display to main (this reverts to the desired setup).
Interestingly it doesn't matter about the monitor numbering (i.e. whether it is 1-2 or 2-1 from LH to RH) or ports used. I've tried every combination (even physically swapping the monitors to the other side). It is always the right hand monitor that becomes the "main display" after a remote desktop login.
I would also like to fix this bug as it is incredibly annoying and seems unnecessary!
There's a way to do this by manually editing an rdp save file.
In short, you need to use selectedmonitors and specify the monitors you want to use for the connection (which you can get from running mstsc /l)
Whichever monitor is listed first will be the main display for the remote computer, and therefore the one with the full taskbar.
For example, in my rdp file, I have:
use multimon:i:1
selectedmonitors:s:4,0
