If you want to see both Seaside and Island Farm missions, simply tap on the “!” icon located in the top left corner of your game screen.
After that a new pop-up window will appear and it will show you the progress of either Seaside or Island Farm’s mission that you’re currently on. You can choose which Farm’s mission you want to see by tapping on the top left corner of the window.
Note: This function works on both Seaside and Island Farm.