Okay I debugged it. There is pixel trigger DF-OPT with 8 defined pixels. If all are shown then is triggered “trigger appear” action. If at least one of them is hidden and trigger was previously triggered then is triggered “trigger disappear”.
1. all pixels appears -> appear
2. hide at least one with cursor -> disappear
3. move cursor away and all pixels appear -> appear
…
This is correct, but useful only for simple things…question is how to improve it