Try clicking on Display Capture and pressing ctrl+f, this will set the source to scale to inner bounds and fit the screen. Should help with the transitions.
Try using game or window capture instead, you should only be using display capture as a last resort for games.
Thanks, that worked.According to a Google search, there are ways to force the game itself into windowed mode, even with the Origin version.
https://www.gamereplays.org/community/index.php?showtopic=973434