I wasn't seeing any way to empty the trash on my webmail. So I went looking on the Internet for the steps to empty trash on roundcube, and right away noticed the problem. The gear icon with the "empty" option wasn't there. I switched the skin from Elastic to Larry, and it was back.
Also, I don't see any way in the Elastic skin to get a folder list on the left side. That's something I really like having, and would like to see in a future version. The other skins don't seem to have a dark mode, which is why I was using Elastic.
Just upgraded to 1.5.2, was on 1.4.11. The upgrade didn't change anything.