How to change theme

1

how can i change salome theme from light mode to dark mode,as fast you can

2

To change theme, on linux, run qt5ct command line. In the window which pops up, set style to Fusion and Pallet to Darker.
Then simply set this environment variable:

export QT_QPA_PLATFORMTHEME=qt5ct

and run SALOME.
On Windows, you need to activate the dark mode.