Nevertheless I'd like indeed to be able to go to layout via an expression (actually writing down the layout name).
Dropdowns are cool, but for certain cases, writing the name of the layout directly would be better. (Consider layout names "Level1", "Level2", "Level3", it would allow for example when doing a "restart action" to write it like :
System - Go to Layout
"Level" & Level
(Where Level is a global var)).
If you can see my logic there.
Workaround is to test what is the current level and then setting the correct action.
Expression would prevent a few useless condition tests.