Change Mail Notification Duration

Have been using Manjaro stable with Mate on PI4 since upgrading my network. Running smoothly, but a few features…

Using Vivaldi’s built in mail client, the mail notification stays on screen for 25 seconds or so, covering buttons etc, hijacking workflow… I would like to shorten this.

Clicking the popup gets rid of it, which opens the mail client, which is not why I opened the browser…

Whether related to the DE or Vivaldi, is there a way to change the duration of the mail notification popup?