Thanks @Kal_Lam; I already created a request for that feature (Link) and then voted for the older request (Link), but almost two years have passed, and it has not been implemented.
We managed to work without the folders before because we had the option to create new accounts for new projects, but now, after the introduction of the new limitations, this feature is highly needed in addition to allowing us to allocate storage and submissions to affiliated community accounts inside our organization. Without these two features, we can’t continue using the kobotoolbox services because, for now, the only way to organize things is to host all projects in the professional account or to buy a professional account for each project, which is not feasible.
