Hi @mby ,
Did you mean Maintenance Plan Folder missing under Management Folder in SQL Server Management Studio? Please using select @@version to check your SQL server edition and share us the output of it. SQL server Express edition has no SQL server agent service, so there is no maintenance plan folder in SSMS.
Please using below query to check if logged in account having sysadmin permissions. If the result is 0, then you login do not have sysadmin permissions, there is also no maintenance plan folder in SSMS.
SELECT IS_SRVROLEMEMBER('sysadmin')
If I misunderstood your issue, please let me know.
If you want to create a maintenance plan, please refer to MS document Create a Maintenance Plan to get more.
Best regards,
Cathy
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