hey, thanks for letting me know! this has been brought up to me a couple times before. i haven't had the time to make Vanguard fully compatible with mobile yet, but i believe if you try a different browser (it's worked with Safari for me personally) there should be an arrow to hide the menu on the right side of the screen (i'm not familiar with formatting for mobile, i'm sorry!!)
if you have a computer browser available to use instead, this would ensure that the game would be formatted as intended :) again, sorry about this!!