Working with documents

Hello. Please tell me why documents open differently in different orders. In some orders, the invoice and expense report open directly in the box, in others - one document in the box, and the other in Acrobat. For example https://crm.smartid.com.ua/51751/. Where to choose where the documents should open? The second question about them is - I found where to edit documents, but I don't understand how to move the "Total amount (amount in words)" block higher in the Invoice and Expense slip documents so that it is on the same horizontal level with the "Total VAT" table row? Because the current placement is such that it prevents me from adding a signature in the editor. Or please tell me how I can automatically add signatures to the box so that they are automatically added to expense and invoices? It is desirable with the ability to add multiple signatures and the ability to choose a default signature so as not to struggle with graphic editors every time. And third - is it possible to generate checks in the box and integrate with time? Thank you in advance.