Sorry to bother you, but I am further plying with Caustic :-).
In the wave editor, when I am touching or clicking on: File, Edit, Process and Tools one time, the sub menu pops up on the left side.
Then when I am clicking on those buttons second time, it sub menu hides.
This is not the case for Effects. The effects are showing up, but second touch or click on effects does not hide sub menu.
The workaround is to click on e.g. File and then second time on File, but ... I expect behavior of the Effect button/menu is the same as others.
I mean this feature is mentioned here: https://www.youtube.com/watch?v=c69kmYUTkKw
I had tested this on Android using Caustic 3.2 and on PC I had check on the same version.