There are some lv2 plugins that display a \textit{glitzy} UI (User Interface); for example the \textit{Calf plugins}. For these LV2 plugins, if you want that to automatically come up without having to click on the UI button on the simplified UI interface, there is a flag to enable that. It is at:
-\texttt{Settings $\rightarrow$ Preferences $\rightarrow$ Operations} tab
+\texttt{Settings $\rightarrow$ Preferences $\rightarrow$ Interface} tab, Operations section
then check the \textit{Auto start lv2 gui} Flag