Hi, I have tried on another computer with Linux mint 21.3 and cinnamon 6.04 : It's correct. So, I think that might be a problem on my main computer (Linux mint 22 - cinnamon 6.2.9), perhaps Cinnamon. This ticket can therefore be closed. Sorry for the inconvenience.
Solved by completely deleting fgdata ("install/flightgear/fgdata") and reloading it
Error when compiling "DATA"
Line missing in fgdata/gui/dialogs/property-browser.xml
Thanks every one, it's correct now.
I confirm, it's only on Linux. It's ok on Windows10.
gui.fileSelector crashes
Thanks to Benedikt for bringing this old topic back to light and thanks to Gijs for resolving it.