Form Details Not Visible In Form View

I have created a form taking data from several tables. When i view in design view all fields are visible. When i switch to Form view i get a blank screen

Anyone got any suggestions as to what is wrong

A form can only be bound to a single table or query. If you wish to bind several tables or queries to a form, you will need to create separate forms for each and then insert them into the primary form as subforms.

Alan

Hi
An addition

Or if there is common field in the tables make a query and insert relationship and the make form that query

Regards