Open config.json in your Bejeweled 3 Plus install and change the "wantExtendedWidescreen" boolean to true. Make sure Widescreen is also enabled in the launcher, or change the "isWidescreen" boolean to true in the config file.
3D Acceleration caused issues on newer systems, and patches were made to get it working properly. Unfortunately, the only downside was that toggling 3D Acceleration on/off or changing the graphics quality while the game is running caused 3D Acceleration to not work at all until the game is started again, which could be why the option was removed.