You can modify the automatic sharing settings for specific upcoming meetings from your Calendar page:
You can only manage sharing for meetings that you choose to add Read to. If "Add Read?" is enabled for a meeting on your calendar, this means that your default sharing and distribution settings will be applied to the meeting. You can change this on a meeting to meeting basis by clicking on the "Share" button from your Calendar page.
Clicking on "Share" will open up a dialog that looks similar to the share dialog in a meeting report. From here, there are two different tabs you can edit, the Share Report tab, which lets you add specific people to the report, and the Access & Distribution tab, which lets to manage the participant access and distribution settings.
Coming soon: For recurring meetings, you'll be able to check a box to automatically sync these settings across all future instances of this meeting. Otherwise, your changes will only be applied to the specific instance that you're editing.
Granting direct access via Share Report
On the Share Report tab, you can add specific people, teams, or even your entire Workspace as viewers or editors on the upcoming report. To share with a specific person, just type in their email address or name (if they have a Read account). To share with a specific team or Workspace, you can click on the name from the list of suggestions, or you can type the name in the box above. This works essentially just like the Share button in your meeting reports, except that you're setting it in advance, so that it will automatically be shared as soon as it is finished processing.
Managing participant access via Access & Distribution

By default, if you add Read to the meeting then your sharing and distribution settings will be automatically applied to the meeting. If you want to change these settings for a specific meeting, you can do so from the Access & Distribution tab. Here you can choose to set the access level for internal and external participants, between "Editor", "Viewer" and "None". You can also choose whether to send a meeting recap via email (and Slack if enabled) to all participants with access, just yourself, or nobody.
Please be aware that if other people also add Read to the meeting, they will automatically get editor access and may apply their own sharing settings as well. Therefore just setting internal and external participants to "None" is not enough to guarantee that nobody else will receive access to your report, nor will it prevent you from sharing the report with people directly via the Share Report tab. If you want to guarantee that nobody else has access to the report, you can do this as long as you are the meeting owner, using the "make report private" option.
Make report private
If you are the owner of a meeting, you can mark it as "private" in order to lock down the sharing so that only you can manage it. In this case, after clicking on the "Share" button, you will see an extra option in the Access & Distribution tab called Make report private:
If you enable this option, it will disable all participant access by setting both internal and external participants to "None". It will also prevent anyone else from adding Read to the meeting, meaning only your sharing settings can be applied. You may still choose to share the report with specific people or teams on the Share Report tab. Also note that this will not prevent team sharing if enabled via the Team Report Access Workspace setting.
Read looks at who created the video conferencing link in order to determine who the report owner should be. You can only use this option if your predicted role is listed as "Report owner". Anyone else who is not the owner will no longer be able to turn on the "Add Read?" toggle, instead they'll see this on their calendar page: