How does Huawei mate9 adjust the size of SMS ringtones?

Find the sound in the settings, as shown below:

Just adjust the volume, as shown below:

Huawei mate9: It is a new generation of business flagship mobile phone launched by Huawei, equipped with Kirin 960 Hisilicon processor and Android 7.0 operating system. It was officially released in Munich, Germany at 9 pm Beijing time (20 16, 1.3), among which Huawei mate9 was released on 20 16, 1.4.

Product configuration: Huawei Mate 9 has a 5.9-inch 2.5D curved glass screen, equipped with Kirin 960 eight nuclear 16nm process processor, and the fingerprint identification of the fuselage returns to the back; On the lens, the mobile phone adopts the second-generation Leica dual camera, and the rear dual lens parameter is 1 2 million color+20 million black-and-white lens, which supports optical image stabilization and 4-in1mixed focusing, and the focusing speed is 30% higher than that of the first-generation Leica.