While the new package server is replicating the packages, the Package Server tab disappears automatically.
Management Platform 7.6, 8.x
The Package Server tab is closed in the Symantec Management Agent (SMA) UI.
Open the SMA, click on View and select Package Server. This will show the Package Server tab properly.
If the above option does not work check the following registry location to see if it exists.
[HKEY_LOCAL_MACHINE\SOFTWARE\Altiris\Altiris Agent\Plugin Objects\Pages\{C7FFB87B-6F41-45FB-89FB-35DE7CC00C72}]
If it does not exist copy the following text, then create a new file named PS.reg, past the contents into the file and execute it on the Site Server with the issue.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Altiris\Altiris Agent\Plugin Objects\Pages\{C7FFB87B-6F41-45FB-89FB-35DE7CC00C72}]
@="PackageServerUI"
"{FF1B80EC-257A-4DF9-8712-74150E4ADB2A}"="Agent Property Sheet"
"UIMode"=dword:000000ff