You can also adjust it by tapping Home > System > Sound/Beep tab > Guidance Volume (pg 93 of the User Manual). It seems to me my touchscreen has a little different menu, something like Home >Settings > Guidance Volume but I can't remember.
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See here buddyThis last week I have been reporting a similar problem with my Feb 2020 CR-V EX model Hybrid.
Just found your earlier posts. Even the dealership now agrees but so far Honda UK has been denying there is a problem. Have you had yours sorted?
Currently getting no response from Honda - possibly due to Lockdown? Meanwhile time is passing and the car hardly being used.
Can't believe that techies at Honda can't simply do a downloadable FIX ????