Traders can choose to activate the isolated positions mode or not. By default this mode is deactivated, meaning that traders can only have 1 position per market. When the isolated positions mode is enabled users can have several different positions on the same market.
Open positions can be edited using the EDIT POSITION button in the Positions tab
The edit position modal will open allowing you to increase/decrease your position and collateral
The modal will display a summary of your new position before you confirm and send the transaction