Where can I find information on how much I owe to my contractors? How can I display debts to my suppliers?

You must enter an Expense with a future date on which you plan to make the payment and specify the category and counterparty in the transaction Finmap will understand everything by itself: it will create a payable (Analytics - Payables section) and show the amount of such payments in the "Future

Finmap will understand everything by itself: it will create a payable (Analytics - Payables section) and show the amount of such payments in the "Planned payments" block at the bottom left.