@Yes123 The transition to Apps from Content Packs is currently a little rough if you were using some of the "Customize" features in Content Packs. From my understanding the features will grow for Apps, but currently they are read-only and there is no flexibility with them as it relates to making versions of your own things from them. They are however, the future as it was announced that at some point Content Packs will be deprecated.
As the @Seth_C_Bauer said, the shared apps are read-only, we can't edit it. So that no users can create dashboards from the Apps There is an feature request, please review and vote it. Maybe the feature will come soon after more people's needs.