Fing Desktop display is off the screen

Hi @Robin
I tried before asking :-).
I even tried to move the desktop back and forth between a non-existing screen and the internal display of my laptop.
It does not change anything. Fing is somewhere off screen.
By the way, there are lots of programs who behave like this. Even worse, some programs remember they were on an external screen and continue to display on a "ghost" external screen when the external display is removed.

Hi @Robin
Please read my question !
THIS IS DEFINITELY NOT A DUAL MONITOR CONFIGURATION. I ONLY HAVE ONE MONITOR ACTIVE AT ANY TIME.
And you will have to answer following question : why do I have to contact the manufacturer of my external monitor to seek advice when my problem only occurs when the external monitor is disconnected !
I suppose you will now tell me to contact the manufacturer of my laptop. Thanks for the advice !
I already had this kind of problem with programs who are known to act this way on dual monitor configuration losing one monitor but Fing is the only program I know who behaves this way in switching from a 4K monitor to a Full HD monitor.

1. First of all, I would like to apologize for my aggressive tone. After more than 35 years of IT customer support, I have to admit that I find it difficult to stand the IT support practiced by large companies who sometimes take their users for fools and where operators are satisfied with standard answers extracted from a list of answers. Users are not fools and not all users are "ordinary" users.
2. When I read your answer, something suddenly became clear to me, something I had forgotten!
   The problem didn't appear when I unplugged the external monitor from my PC, it appeared when I unplugged the docking station to which my external monitor was connected.
   This may make all the difference!
   Because in fact you don't just change the screen, you also change the graphics card.
   My configuration consists of an HP Probook 470 G5 laptop equipped with a Nvidia GeForce 930MX graphics chip and an Intel UHD Graphics 620 chip. When I add the docking station, my configuration is enriched with a graphics card called "HP USB-C Universal Dock" articulated around a "DisplayLink Display Adapter" chip.
3. Another point that I tested and where I would like to make sure of what you tested :
   First, I unplugged my docking station (and my 4k external display) when the Fing window was open in the bottom right corner of my external display. Everything went perfectly well: the Fing window was still open in the bottom right corner of my laptop's FullHD display.
   After that, I unplugged my docking station with the Fing program minimized in the notification area of the taskbar. Nothing happened as desired: when I asked for the Fing window to open, the program name appeared in the taskbar next to the other open programs (Outlook, Word, Chrome, ...) but the Fing window was nowhere to see. It must have been somewhere outside the FullHD screen of my laptop.