Booking a Zoom meeting within Google Calendar uses the settings applied to the Zoom Extension. These settings can be accessed / amended via the Zoom Extension icon which can be found in the Chrome Browser.
1) Open a session of Chrome and navigate to the Zoom Extension (See below). When the pop-up window appears, click on the gear icon to access settings.
2) Here, you can apply settings Zoom will use when next creating a Zoom meetings through Google Calendar.
3) When you are happy with the chosen settings, click on “Save Changes”. The settings will apply to all meetings created via Google Calendar going forward.
4) If you prefer to review and use different setting for different meetings, click on the box next to "Allow me to specify schedule options each time" before saving. When next creating a Zoom meeting via Google Calendar, you will be prompted to configure the meeting settings.