Select Single - Quick Start Option Missing in Custom Drawer

Summary:

Hello,

We are trying to create a custom drawer on the opportunity object and want to create a drop down using the Account SDP in it. However, the Quick Start option is missing on the Select Single component on the drawer:

We also tried adding a SDP variable manually in the Data property of it, but when we do so, the entire drop down disappears. Are we doing something wrong?

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