A view itself is the workspace where the model or its part is rendered
in a required projection. At the same time, several views can be
activated. Adjusting settings of the views can be done simultaneously
or separately. When working with the TS models you should, first of all,
get a clear understanding of the fact that an open model might have no
views, which does not mean that the model is empty.
Now intentionally close all the views of the model. Refer to the below:
Tekla Structures v21.1
Tekla Structures v2021
In most cases, when opening a project created by another user, you might
see that the editor looks just like in the picture below. But it does not
mean that the file is empty. There are just no views in it.