Yes, you can. Because we already get an email notification whenever the visitor submits the forms. Moreover, the WPForms summary shows the number of total submission entries only. However, it does not reveal the entries; until you subscribe to their paid options. This notification does not serve the purpose of free users. Thus, you can disable them.
- Go to WordPress admin
- WPForms ➔ Settings ➔ Misc tab
- Check the box with label Disable Email Summaries weekly delivery.