You're the owner of your own content, which means that once you exclude your surveys and reports from a workspace, workspace members won't be able to access or edit your items.

1. Navigate to the workspace you want to exclude items from.
2. Select the item(s) you want to exclude by marking them.
3. Click the actions menu and select exclude.
4. A dialogue box will pop up asking if you're sure, if you are, click exclude.