Is the Mudarib obligated to compensate the capital owner from his personal wealth for losses exceeding the agreed-upon percentage in the Mudarabah contract, especially when the capital owner demands compensation and makes supplications?

It is forbidden to deal with the margin trading system because a resolution prohibiting it was issued by the Islamic Fiqh Academy. If it was agreed that you get 20% of the profit and the capital owner gets 80%, and you stopped speculating when the loss reached 40%, then you requested to continue to recover the capital, you are not responsible for guaranteeing the principal, and the loss falls on the capital owner, unless there was negligence or dereliction on your part, in which case you are liable for compensation according to the opinion of experts. You must also inform him of the prohibition of dealing with the margin system.