Navigate to the Web App:
- In your space, click on the 'Add Content' menu at the bottom of the page
- Click on 'Recent' to view all the content that you have uploaded
- Or click on 'Stuff' to view some of the objects that are added in by default
To HIDE any content from your Content Menu, click the "X". That hidden content will not appear in your content menu when you are in Spatial.