Under the "Reminders and notifications" setting, there is the setting for the weekly letter. In the drop-down list, you can choose which day the weekly letter should be sent. You can also mark "Do not receive a weekly letter" if you don't want to receive weekly letters. Finish your changes by clicking "Save".
Deciding whether to send a weekly letter without events or activities is possible.
With this setting enabled, you will receive weekly newsletters even when there are no upcoming events or recent activities for that week.