I use mattermost in Windows.
Attached screen is seen when clicking list(e.g.Email Notification) under Desktop Notification in Notification in Account Settins
after clicking The Desktop Notification.
It is corrected by dragging up. But when encountering first, it looks lag of the program. So I think improvement needs.
What desktop app version are you on?
desktop app version 4.3.1
What OS and version are you on?
Can you share log errors via https://docs.mattermost.com/install/desktop.html#reporting-issues?
Can you help take a look at the troubleshooting guide via https://docs.mattermost.com/install/desktop.html#desktop-app-window-is-black-and-doesn-t-load-the-page?