You can specify frame size and position at any time, including at Emacs startup and interactively, incrementally. At Emacs StartupPossibilities: Use command line options-mm: Maximize the first frame. E.g, use this as the Target of an MS Windows shortcut: runemacs -mm.-geometry: Set the first frame’s dimensions. E.g., emacs -geometry 80x24 for a frame 80 chars wide and 24 chars high.Use file ~/.Xre