From the reports page when you pick a report like "Single Game" you can select period to show just period 1 then run the report a second time to show period 2.
From within the game, go to the game data collection screen.
Select the team icon ("Park show selected above")
Now select "Half" at the bottom - the data and the shot chart will show the 1st half.
Select the arrow control in the bottom right corner to switch to period 2.