We set a session to avoid asking it at first start.

diff -ru lxqt-session-1.1.0/config/session.conf lxqt-session-1.1.0.new/config/session.conf
--- lxqt-session-1.1.0/config/session.conf	2022-04-16 15:16:20.000000000 +0200
+++ lxqt-session-1.1.0.new/config/session.conf	2022-04-25 21:01:49.837271761 +0200
@@ -1,5 +1,7 @@
 [General]
+__userfile__=true
 leave_confirmation=true
+window_manager=openbox
 
 [Environment]
 GTK_CSD=0