How deactivate Nextcloud/mail as application for mail-links

In the settings in Nextcloud/Mail I can register the Mail app as application for mail links. It seems that I have activated this. Wherever I clique on a mailto link Nexctloud/Mail opens.
I want to deactivate this behavior. I cannot find where this is registered. In Windows Google Chrome is marked as standard e-mail handler.

I have NC18.0.2 I use Chrome as browser in Windows 10.

google is your friend:

  1. Open your Chrome web browser.
  2. Click the Chrome menu icon in the top right-hand corner of the window.
  3. Click Settings .
  4. Click Show Advanced Settings at the bottom of the page.
  5. Under “Privacy,” click Content Settings .
  6. Scroll down to the “Handlers” section, and click the Manage Handlers button.
  7. Select your desired, default email client (e.g. Gmail).