Could you try disabling these options: "Show fill helper for browsers" and "Show fill helper bubble for apps," you can also try disabling the other options one by one to see if that has the desired effect as well. Please note that disabling autofill/the fill helper may stop LastPass from autofilling in to apps and sites, there may not be a specific option to only disable the option to ask if you'd like to save/update passwords.
RachelO is a member of the LogMeIn Community Care Team.
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