I just watched the YT video about ACE compressor plugin, so I starded Ardour, inserted this plugin, but the UI is very different from the video. In my case UI is minimalistic. I use LV2 version (I don’t know if there are other versions). How to make ACE plugins to look like here:
The ACE plugins UIs are closed-source, but gratis. They do come with Ardour’s official binary. They also come with the demo version so you could copy the harrison.lv2 folder from there.