my.setScreenOrientation

my.setScreenOrientation({
  orientation: 'landscape',
  success() {
    console.log('Orientation set to landscape');
  }
});

Page({
  enterFullscreen() {
    my.setScreenOrientation({
      orientation: 'landscape',
      success: () => {
        this.setData({ isFullscreen: true });
      }
    });
  },

  exitFullscreen() {
    my.setScreenOrientation({
      orientation: 'portrait',
      success: () => {
        this.setData({ isFullscreen: false });
      }
    });
  },

  onUnload() {
    // Restore portrait when leaving the page
    my.setScreenOrientation({ orientation: 'portrait' });
  }
});

Page({
  onLoad() {
    // Lock to landscape for game
    my.setScreenOrientation({
      orientation: 'landscape'
    });
  },

  onUnload() {
    // Restore portrait when leaving
    my.setScreenOrientation({
      orientation: 'portrait'
    });
  }
});