Have been trying on and off through different versions to enable widgets for RSS feeds.
Never been able to do it.
In Settings > Widgets > RSS Widgets, I tried to enable eM Client RSS, but nothing happens, and when I come back to settings it is not enabled. So I added another RSS feed, but the same thing happens. They are never enabled.
Ok, I was able to duplicate the problem. If the tab is not visible on the folder pane, it will not accept activation of the widget. Right-click on a tab and make sure “Widgets” is checked.