Expense Header page layout is not displayed according to the Event Configurations in CRM.
The user profile has Field Level Security (FLS) on the following three fields of the EM_Event_Layout_vod object:
To use the page layout engine for Expense_Estimate_vod, Expense_Header_vod, and Expense_Line_vod objects, remove FLS Read permission to the above fields on the EM_Event_Layout_vod object.
CRM Help Documentation: Defining Page Layouts
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