As of June 2014, there does not appear to be a way to turn off Creative Mode in "Space Engineers." However, the player can change to Survival Mode by going under "Load Game" and selecting "Edit Settings."
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If you are playing on a PC single player mode, type /gamemode s This will toggle the gamemode back to survival mode.
You need to turn cheats on and then press / and then type in gamemode c to switch to creative mode or gamemode s to switch to survival mode or gamemode a to switch to adventure mode
Before starting the server, there is an option in the server.properties that sets the default game mode. If you are using the Multiverse plugin, you will need to set it in plugins\Multiverse-Core\ for each world.While the server is running, either type gamemode [player name] 1 in the console or (if you're an op) /gamemode [player name] 1 in the chat to set creative mode for an individual player, which can be yourself or someone else.In either case, 0 means survival mode and 1 means creative mode.
You pause the game by pressing start, then proceed to press R1, L1, R2, and L2 at the same time. This should prompt a screen to show up, which will help you activate creative mode in the game. Now that creative mode is on you should have unlimited money, and Spoot the Llama, who tells jokes. Spoot can be found in the miscellaneous section of the decor section, he's not the first option, btw. On the down side, you can unlock no challenges while creative mode is on, and you cannot turn it off once on. Which makes it a good idea to save your game while activating creation mode, there'll be a screen for it.
You cannot turn it into Zen mode. It Turns into zen mode when it is low health (when the health is in the red)