Explanation
Table Description automatically generated

Box 1: Open the model-driven app in the app designer.
1. On the app designer canvas, select the Dashboards tile.
On the app designer canvas, the right pane shows dashboards that are available in the default solution.
2. Clearing the corresponding check box.
Box 2: Open the site map in the sitemap designer and delete the Ideas dashboard from the Results group Site maps define the manner by which users move between tables in a model-driven app.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/add-edit-app-components