A "Space" is where your scenario lives and becomes an experience that people can interact with.
When you publish a scenario it's uploaded to the Conducttr engine and runs in your private space.
You can invite others to share your space but remember you can only run one scenario at a time.
Selecting a Space
If you have several spaces available to you, you can change the active Space for current scenario by going to Setup and clicking the down arrow from the Active Space control