In most cases, each computer will have more than one browser installed. This is common because any browser can be an alternative to browsing activities. The existence of several browsers can be another alternative if the browser used is problematic for some reason. Using more than one browser can also provide a different browsing experience.
Of the several browsers on your computer, one browser will certainly be your favorite browser for browsing activities and another may only be used occasionally. Due to being a favorite browser and one that is often used, you may already have a lot of bookmarks in that browser.
Changing the Whatsapp number might be one of the conditions that is often experienced by users. Whether it's for reasons of wanting to make contacts more private, or because the old number is no longer active.
The problem is that many of them are worried that doing so will delete all chats, contacts, or important data in them. So you won't lose your important chat data if you change your number through this feature.