Can't set conditional layout rule on lookup field in Zoho CRM

Can't set conditional layout rule on lookup field in Zoho CRM

Namaskaram Zoho CRM team,
     Usually any fields of module except mandatory fields can be hide using conditional layout rules.  But that can't be set on lookup fields event that is not a mandatory fields.  Many users are in need of that.  

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InfoModeration update: Lookup fields and Multi-select picklist fields are now supported in Layout Rules. Additionally, Layout Rules is now available in the Professional Edition. These updates have been rolled out to all users.