Fullscreen across multiple displays?

Running Mint Debian 7.
I have two 720x720 displays I’m using for two separate gauges in my cluster.
Launching Realdash in fullscreen only opens on one display, I can maximize the app and drag it across the two displays and line it up the way I need it, but when I re launch Realdash it doesn’t stay in a maximized window across both displays and opens in a smaller window on one display.
I’m looking for the app to fullscreen across two displays or remember the last maximised window across two screens.
I’m told a tiling windows manager may be my solution, but I thought I would ask here before jumping into anything.

The only multimonitor setup we have tried is on RPi on Raspbian OS. That will extent the desktop and RealDash on fullscreen mode will fill both screens. It even seems to remember the last setting ok.

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I have dumped the x86 mini pc and have gotten an RPi 5. It took me a while to get realdash running as I had to remove gpiod, libgpiod and track down the older versions to get it to launch. It looks like since October the old gpio setup has been rolled into version 3, but it doesn’t work with Realdash. I will check how the dual screens work when I’m not tired, lol. If it doesn’t work I’ll get a second RPi 5.

I got a rpi5 but it isn’t expanding across both screens. Do you know the settings to do this?

We just set the desktop to extend to both screens and then set RealDash to fullscreen mode.

It might be display dependant. Only one screen will show Realdash in fullscreen, but only half of it, while the other screen still shows the desktop.
I’m actually just moving to two Rpi5 units for now.