Today UGENE is able to show annotations only if sequence is available. All you need is to open the sequence and drag-n-drop objects with annotations to it.

Doing this you can visualize as many annotations as you want in the same window. If you do not have a sequence, you can use fake one. For example open any plain text file as  "raw sequence" file. You need to check that the length of the file is enough to fit all annotations.

And yes, we will consider using different forms for different annotation types!