Currently Tableau doesn’t have personal folders kind of structure. With below steps you could create a personal folders for your organization.
1. Create a new project – Personal folders
2. at permissions – For “All Users” set project permissions as – Publisher. Leave rest all to none
3. click on “Edit Content Permissions” and then select “Locked to the project”
personal folders are ready. Content is only visible to publishers and admins only.
How to create personal folders in tableau.