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 Recently figured out how to force YouTube to use expanded view (1280x720px in this case).

C:\Users\USERNAME\AppData\Local\Google\Chrome\User Data\Default\User StyleSheets\Custom.CSS - open it with notepad and past the following text, after pasting simply go to file and save.

/* this is to resize the video player */
#watch7-video, #watch7-main, .watch7-playlist-bar { 
    width: 0px /*0px*/ !important;
    /* use first value if you moved the
       playlist to beneath the video player,
       else use the second value */
}
#watch7-player {
    height: 750px !important;
    width: 1280px !important;
}
#watch7-playlist-tray-container { 
    height: 795px !important;
}
div#watch7-sidebar {
    margin-top: 10px !important;
}
 
/* this is to move the playlist from the right
   of the video player to beneath it, 
   left of the "similar videos" column */
div.watch7-playlist-bar {
    position: relative !important;
}
div.watch7-playlist-bar-right {
    position: absolute !important;
    top: 854px !important;
    left: 650px !important;
}

ExampleEdit

Maxwell123 (talk) 16:21, January 25, 2013 (UTC)