On my weekly pages, I write in three columns. Due dates go in the outside column, must do tasks in the middle, and should do tasks on the inside, near the rings.
I picked the area near the rings for the most minor priority tasks for two reasons.
1. My handwriting is not as nice near the rings.
2. My page marker, used to bookmark the current day, hides the part near the rings.
The second reason is the critical motivation for using a thinner page marker. I'm hiding items that can be done, but are not critical. When I open my planner to today's spread, I get to see the MUST DO and DUE tasks only.
Having a layout like that helps me focus on what must be done. A thicker page marker would hide the information that I need to see.
If your page marker is too thick, consider getting a thin one. (Mine comes from a Plan Ahead planner.) Or make your own out of thin plastic or a plastic file folder.
Happiness is Homemade