Mae'r dewisiad hwn yn dewis pa effaith sy'n digwydd pan fo clic dwbl ar y bar teitl. Dewisiadau dilys yw 'toggle_shade', sy'n cysgodi/di-gysgodi'r ffenestr, 'toggle_maximize' fydd yn ehangu/lleihau'r ffenestr, 'minimize' fydd yn lleihau'r ffenestr, neu 'none' fydd yn gwneud dim byd.
This option determines the effects of double-clicking on the title bar. Current valid options are 'toggle_shade', which will shade/unshade the window, 'toggle_maximize' which will maximize/unmaximize the window, 'toggle_maximize_horizontally' and 'toggle_maximize_vertically' which will maximize/unmaximize the window in that direction only, 'minimize' which will minimize the window, 'shade' which will roll the window up, 'menu' which will display the window menu, 'lower' which will put the window behind all the others, and 'none' which will not do anything.