1 - Create a conditon called "big_note" start "false"
2- In "Big note"object properties link the big note object to the condition you create above.
3- in "Big note" actions add:
Cursor leaves objects area
Change condition "big_note" to "false"
4 - in "small note" actions:
use execute command on object
"look" executed ----> change condition "big_note" to "True"
*don't forget to draw an object area for each object