【Updated: 】
You may have enabled the Power Saving option in the Settings menu.
Enabling Power Saving will reduce the game's power consumption in various ways, including:
・The map will no longer be displayed during races.
・Certain course-specific visual effects will not be displayed.
・The animations of opponents will be simplified.
To enable or disable Power Saving, tap the Menu button on the main screen, Settings, and then Power Saving.