刚发现打开APP点击新页面时,有声音,不喜欢有声音的,想关掉,可是找了好久都没找到在哪儿关。想请教一下怎么关闭?

操作系统:Android 9 (vivo NEX A/PKQ1.181030.001 release-keys/App7.01/v20007013)

WebView:Mozilla/5.0 (Linux; Android 9; vivo NEX A Build/PKQ1.181030.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 Mobile Safari/537.36