@flaviu2 I still don't get your "problem". If your download list is too full to see the active downloads, just remove the completed ones. It's logical.

I guess is a bug tough: see my post from here: https://forums.opera.com/topic/40010/download-item-that-takes-long-is-not-visible-when-other-is-filling-the-download-list/6

There is a situation when the active download has disappeared.

@flaviu2 No, I don't know what you mean.

Just follow these steps and you'll see what I'm talking about:

1. Start a download that take long time (hours).
2. Start another download that take short time.
   Repeat step 2 until the long time download is not visible in the floating download list from right side:

Ok. When you go in downloads tab:

You will see all active and completed downloads. But, if the active download is stopped (from network errors for instance), you will not see or find the active download in the download tab and in download floating list either.

Yes, I forgot to specify this detail in the original post, I noticed just now.

Isn't there an option to remove completed downloads?

To remove completed downloads I would consider a solution. The idea is to have all downloads in my lists, completed or not. But yes, if I clear completed downloads, I can see my active downloads. In this way, I have lost my completed downloads.