The man page for yad says "Size of icons may be set in config file." unter List -> Column -> Img. So i added icon_size=16 to ~/.config/yad.conf but it doesn't work. icon_size=16,16 doesn't work either.
By the way: The MDIR description starts with MFL (in List and Form options). In ~/.config/yad.conf it says "Ingnore" instead of "Ignore".
And Ticket 245 is not completely fixed.
Thanks for your patience and time.
fixed in r890