As well as the aforementioned CTRL-D shortcut, you can change the amount of time the splash screen is displayed... although it does require opening up the Chrom

As well as the aforementioned CTRL-D shortcut, you can change the amount of time the splash screen is displayed... although it does require opening up the Chromebook (to set a jumper) and then writing a modified BIOS to the Chromebook: https://johnlewis.ie/neutering-the-developer-mode-screen-on-your-chromebook/ https://johnlewis.ie/neutering-the-developer-mode-screen-on-... Not for the faint of heart, but at least you only need to do it once...