ON left navigation area of ICC for Mac, go to center ‘games are’ click on ‘examine mode’ then right click on board and choose from popup menu “Open game library’. Select pgn file on your computer. Then the view will change you’ll be in my games. To left top next to board you see files you opened in drop down list. click on it and you’ll see the games in it load below. click on the game you want. then in this view on toolbar choose examine on toolbar for a bigger board.
On mac’s with mousepad, a two finger tap will bring up the right click menu.