Since Cloud's last release, it's no longer possible to switch the project navigation back to the old default as per: Configuring Project Navigation
If your interested in the statistics in the 'overview' page, you can use the 'issue statistics gadget' to view them. This won't require a filter and will look very similar to the old view and won't require a filter to be created.
To do that:
- Create a dashboard to show the statistics
- Add the Issue Statistics gadget to it (one for each project and statistics)
- Select the project from which you want to see these statistics
- Select in 'Statistic Type' the field you want to see (for example, statistics that were shown in the 'overview' page include: 'priority', 'assignee', 'status' and 'component')