Hi Habibzadeh,
The reason you are seeing only cells on the edges of your landscape transition is because, as stated in the documentation (https://syncrosim.com/index.php?title=Transitions_-_Spatial#Patch_Prioritization), “A patch is defined as a group of contiguous cells that are all eligible for transitioning by a transition group.” Since you state that all cells are eligible for the transition, your entire landscape represents a single patch.
Regards,
Leonardo