Standard Edition can not use the diagnostics and tuning packs. These options are only available as a paid option on top of Enterprise Edition.
The option packs can be disabled in the OEM interface itself, in the preferences section, but OEM will also honour the database setting for the option packs. To see the performance home you will need one of the following at the database level.
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But as I said, diagnostics and tuning are separately licensed options of Enterprise Edition. Attempting to use them if you have not paid for them is illegal. They can not be legally enabled with Standard Edition, Standard Edition One or Oracle XE.