The volume button was too loud when flipping pages in a novel on the Huawei Mate20. This could be caused by the following reasons: 1. The problem with the novel itself: It is normal for some novels to make a louder sound when they turn the pages. However, if the voice was too harsh, he could consider changing the source of the novel or downloading the novel again. 2. Software issues: The Huawei Mat20 comes with an application called "Huawei Reading". There may be some software issues that cause the sound to be too loud when flipping pages. You can try uninstalling the application and reinstalling or updating to the latest version to see if there are any problems. 3. Setting problem: If the above methods cannot solve the problem, you can try to find the sound setting in the settings of the Huawei Mate20 to adjust the volume of the volume button. If the above methods cannot solve the problem, you can try to connect the phone to the computer and use a third-party tool to tune it. Some third-party tools can help you check the source of the novel or fix other software or settings problems.