Calendar: Restore the Previous Calendar List View Without the "Hidden" Group or Add a Visibility Setting

[gala514]

Is your feature request related to a problem? Please describe.

In Calendar version 5.0.9, a "Hidden" group was introduced, where unselected calendars are moved. We request the removal of the "Hidden" group and a return to the previous calendar list view, ensuring it is always expanded, displaying all calendars (both hidden and visible) in a single unified list, as it was in version 4.7.16. Alternatively, please add a setting to manage the visibility of this group.

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