Since version 7.16, when creating a new project, TopSolid only references TopSolid’s libraries so as not to overload the project with libraries. You must therefore reference the libraries manually: right-click on "References" and then "Reference library".
Choose the libraries you need and validate. It is also possible to create a project model. To do this: create a new project, reference the libraries as indicated above, right-click on the name of the project, "Others", then "Add to templates".
When creating a new project, you will be then able to select the project template where the libraries are already referenced.