It is a well known aspect of MTG Arena that if the programming detects a series of effects that result in a win/loss the settings cog will disappear from the screen thereby removing the option to concede. If that series happens to be a loop effect both players are forced to watch that loop in its entirety regardless of how long that loop takes. Forcing the losing player to watch as a series of animations shows you losing 1 life at a time or mill 1 card again and again in a loop can take a very long time considering how much life a player can gain in a match or how many cards they can have in any given deck. Rule 104.3a of the MTG comprehensive rules clearly states "A player can concede the game at any time. A player who concedes leaves the game immediately. That player loses the game.". Player agency to concede at any time and immediately leave the game has been a fundamental aspect of this game since its earliest days and is an important part of the game. Be it for knowledge of a winning combo or to escape from a toxic player. Designing the UI with the concede option behind the settings cog is an extra hassle to player for multiple reasons least of all that it delays the ability to reach that button as the loop is going to take effect. Removing the settings cog because the UI has already calculated the game as a loss as soon as a winning loop activates denies player agency to act on MTG rule 104.3a to concede the loss rather than sitting and waiting. I suggest that you remove any part of the programming that removes or disables the settings cog for any reason as it is in no way required for game play and could only be there to force players to stay and watch what ever aspect forced it away. I suggest a quick concede option like a main screen click and drag toggle or a combination of keys pressed at once. Having to slide the toggle or press for example alt c n d keys would eliminate accidental use.