You can disable DLC on steam. In steam preferences, remove dlc from your account. This method will also remove the civ from the random pool unlike in simple dlc disable option where only campaigns are disabled. You can later restore it in steam support if you want to.
Click on the “Help” button (top left of the steam window), then “Steam Support” → “Games, Softwares, etc” → search for the game to delete, click it → “I want to permanently remove this product from my account”.