On an iPhone, Chrome's incognito mode runs separately from the regular browser. Although you cannot
disable incognito mode, you can switch between the regular and private windows.You do not have a specific option to turn off incognito mode. All you have to
do is launch the Chrome app on your iPhone. Next, tap the Square icon to switch
between incognito and regular windows. When you are finished, tap the X icon to
close incognito mode on iPhones. The following actions will show you how to
enable or disable incognito mode for Chrome on iPhone. If you don't want to
close it completely, you can simply switch between regular and incognito
windows.
See also
https://contactforservice.com/chrome-users-alerts-virus/
