What is the difference between ELFi isolated and crossed?

Yes, you can choose between isolated or crossed margin trading on the trading page. Isolated margin means your positions are entirely independent, with the position risk determined by the liquidation price. If the index price falls below the liquidation price, the position will be liquidated, and you will only lose the margin invested in that specific position. Cross margin uses all deposited assets to calculate the account's risk ratio collectively. If the risk ratio is triggered, multiple positions and assets in the account will be liquidated together.