Setting: URLM_WGET_SPLIT_SIZE

Integer; how tall (in screen lines) to make split windows created by
/wget or /urlm_wget. Set to zero (the default) to use hidden (full-sized)
windows instead of split windows.

Try not to set this too high; if urlmanager is unable to resize a window
to this size, the window will remain at the default size (as used
by the /window split command).