Archive or at least a filter to hide old and rarely used build projects and plans

We have many build projects and build plans which are no longer actively used, however we cannot delete them, because we might have to use them in the future e.g. in case we need to build a maintenance release.

The existing filter options allow to filter by project or label.

We would appreciate to have one of these potential improvements:

Option 1: Archive:
Allow to "archive" projects and/or build plans, which could be to move them to a 2nd "space" which is usually out of sight for Bamboo users. This "archive" could e.g. be accessible from an additional entry in Bamboo's main menu.

Option 2: Extend filter to exclude projects and plans with a defined label "Hidden":
Bamboo could come with a predefined, exclusive label "Hidden", that one can use to label expired projects and plans and that one can select in the filter option to exclude projects and plans from being shown in the regular list.

Note: We are currently using Bamboo 5.6, but I did not see such a feature in the release notes for the newer versions.