I have several GOG games.

All of them launch on monitor #1. This is not the main monitor. Primary is #1, main use is #3

How do I tell the launcher to launch all games using monitor #3?

None of the games I have purchased contain multi-monitor support in their respective "options" sections.

EDITED: clarify phrasing.

What OS? Windows 11?
What GPU?
Do you play them with the Galaxy client, or running the standalone installer version? (Not sure if this affects how the game behaves, but still...)
Can you give some examples of such games, many of us can try if we have any issues with them.

I quickly tried e.g. Dungeon Siege 2 (standalone version, no Galaxy), and at least it ran fine on my primary display (set as such in the Windows Display Settings), which is the external monitor connected to my laptop HDMI port. The laptop screen is the secondary monitor to which I have extended the desktop.

This is Windows 10 Pro.

As a quick fix, I guess you can set in the Windows Display Settings that only that monitor, in which you want to play, is active. Unless you really need those other screens as well, while playing.

Are you sure it's not the primary monitor?

Anyway on Linux when using X11 you can run something like:

xrandr --output DP-2 --primary

to make the monitor labeled DP-2 be the primary before the game launches and then run xrandr again to switch back after the game exits.

An annoying issue for sure.
if you hit Alt+Enter it'll often put the game in windowed mode, then drag it to your primary and Alt+Enter again. Usually they remember, but this is game specific, so if it doesn't I'd contact the developer.

Windows+Shift+Left Arrow can also move the window to the next display on the left or you can use right arrow to move it right.

If in Windows, set display #3 to be your primary display, then make sure you're showing the taskbar on all displays. Not the neatest fix as it will default to #3 for everything that goes to default, but should do the job.

Sorry, would be helpful info :P

OS: WIndows 10 Enterprise
GPU: RTX3060
Launched in both stand-alone and the GOG client
Games: Tachyon The Fringe, Star Trek Armada II

I could change the Primary monitor to #3, that does work, but I have to switch it back after playing. Not an ideal solution.

@Swissy88 - Thanks, but this didn't work in either game.

@EverNightX - Thanks, this also didn't work.

@pds41 - Thanks, as I said this does work but I have to reset everything when done playing so not ideal.

Thanks everyone for the input :D

An oldfashioned switchbox... click click. Problem is, you will have to make it or have it made, most likely.

They make them! I have two that I use for different sources to a tv and a monitor with single HDMI ports.

Oh, I apparently misunderstood your problem.

I thought you have set monitor #3 as your primary monitor in Windows display settings, yet GOG games refuse to run on that primary display.

But your real issue apparently is that #3 is not your primary monitor (and you don't want it to be), but you still want to run your GOG games in it?

If that is the case, then I give up, I have no idea how to achieve that for any PC games, be it for GOG, Steam, Epic Games or whatever. Unless you make the game run in a window and then move that window to monitor #3.

If you were running something based around user control, I'd give you exact instructions on how to place the window on the exact screen you wanted.

Oh well.

Same here. The phrasing suggested that the game did not run in the primary monitor...

I would switch forth and back, no problem, it is painless... I wonder if a little script might be written to make that even easier?
Also, if you use monitor #3 onky for playing, a switch box would help.

Yeah my monitor setup is a bit werid. I'm a software dev.

Monitors 1 and 2 are 1080 one over the top of the other, on my left.
Monitor 3 is a 4K in the center of my desk.
Monitor 4 is also a 1080 in portrait, to my right

Monitor 1 is the primary, only monitor with the task bar. Monitor 3 is my "working/playing" monitor.

All my Steam games launch to monitor 3, but the client displays in monitor 1.

All of my GOG games are very old, so not holding my breath here. :P

Tried the DXconfig utility, but it doesn't recognise multiple monitor setups.

The switchbox idea is a good one. All my monitors have multiple inputs, I could "toggle" 3 to 1 and 1 to 3 using the different HDMI/Display port and change the monitor source. And I have an old switch. Might try that :P

Thanks for all the replies. Appreciate it.

:D

Win key + P, close all other monitors before starting the game, after having started the game, you can switch all other monitors back on. For me, after having done this once, somehow the system "remembers" which monitor it used last time, so I don't have to do this every single time.