You can easily track and make changes to your positions using the Positions Widget, where you will find all details about your positions, such as order Fill price and size, Unrealized P/L, etc. You can also add/edit Stop Loss or Take profit to your position by right-clicking on the desired position.
To Close a position fully or partially, you can click the cross (X) on the right side of each position row or right-click the position you wish to close and choose the ‘Close position’ option in the drop down menu
To Modify a position, right click on the desired position and select 'Modify Position' in the drop down menu. This will allow you to add/edit Stop Loss/Take profit, take partial profit and close a position manually