Cannot use backups over 60 days old in FR console despite tombstone time being 180 days. (4252583)

This was changed to cap the list and improve performance, it is not specifically tied to the tombstone lifetime.
In order to expand the time range, do the following:

Close any projects or Forest Recovery consoles.
Edit the following file:
\Program Files\Quest\Recovery Manager for Active Directory Forest Edition\FRConsoleSettings.xml

Modify the following line:
 <MaximumBackupAgeInDays defaultValue="60">60</MaximumBackupAgeInDays>

Change the value, but not the defaultValue to the required age as needed, like so:

 <MaximumBackupAgeInDays defaultValue="60">180</MaximumBackupAgeInDays>

Enhancement ID ADO-259764 has been submitted for consideration in a future release.
This will allow changing the days within the console interface.