Since in creative, you've got access to infinite amounts of any block or item, there's no real need for the inventory. You could consider the selection menu to be your inventory or sorts.
However you so still have an inventory, and it can be seen by interacting with blocks like a Dispenser.
Chat with our AI personalities
In Minecraft Classic, mobs can't spawn, so they can't exist naturally. If you play the Survival Test, and when mobs spawn there, you can save it and open it in creative mode so then the mobs can stay there. However, in Minecraft Creative Mode, mobs can spawn, but they can't hurt you because you have no healthbar.
Pressing 'E' will open your inventory.
you press "E" (previously "I")
Tap the 3 dots next to where it shows your inventory.
Open chat, and then type "/gamemode #" (without quotes) Replace the # with: 0 (survival mode) 1 (creative mode) 2 (adventure mode) (only works if you enabled cheats when you made the world)