How to remove password autosave in the browser?

The browser settings that you use are responsible for this. Disabling instructions can be found at the links below:

For Google Chrome: support.google.com/chromebook/answer/95606?co=GENIE.P..
For Opera: help.opera.com/en/latest/web-preferences/
For Yandex Browser: yandex.ru/support/browser/security/passwords-saving.h..
For Firefox: support.mozilla.org/en-US/kb/sohranyonnye-paroli-zapomin..
For Internet Explorer: windows.microsoft.com/en-us/internet-explorer/fill-in..
For Microsoft Edge: support.microsoft.com/en-us/help/4028534/windows-10-r..
For Safari: support.apple.com/en-gb/guide/safari/sfri40599/mac