Thanks. However, my 13inch won’t have that option because it only has one GPU, so it can’t do any switching. The 13 inch only comes with the integrated GPU and no discrete GPU, so it doesn’t have automatic graphics switching option.
Intel Iris Graphics 550:
Chipset Model: Intel Iris Graphics 550
Type: GPU
Bus: Built-In
VRAM (Dynamic, Max): 1536 MB
Vendor: Intel (0x8086)
Device ID: 0x1927
Revision ID: 0x000a
Metal: Supported
Displays:
Color LCD:
Display Type: Built-In Retina LCD
Resolution: 2560 x 1600 Retina
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: Yes
Connection Type: DisplayPort