LXQT

to change window manager 

LXQT Settings -> Basic Settings

to enable transparency:

 LXQT Settings -> Basic Settings and enable compton

 

to change qt theme:

LXQT Settings ->Session settings->Environment and add

QT_PLATFORM_PLUGIN qt5ct

QT_QPA_PLATFORMTHEME qt5ct

then install qt5ct

 if firefox opens baobab

mimeopen .

outputs
Please choose a default application for files of type inode/directory

        1) Disk Usage Analyzer  (org.gnome.baobab)
        2) PCManFM-Qt File Manager  (pcmanfm-qt)
        3) Other...
then choose

mod3 stealing by the start menu:

right click the start menu, change the keyboard shortcut

change wallpaper form command line :

right click on desktop, change the wallpaper mode to image and then

pcmanfm-qt --set-wallpaper="$imagePath"