You should strive to sit with your head balanced on top of your neck, with your arms relaxed at your side and elbows at 90 degrees. wrist rest. good seating position. no donut cushion. etc
tilting your head back to look at a monitor above or to the side will use muscles to hold your body in place and misalign your spine/etc. leads to fatigue/stress/long-term issues
You should strive to sit with your head balanced on top of your neck, with your arms relaxed at your side and elbows at 90 degrees. wrist rest. good seating position. no donut cushion. etc
tilting your head back to look at a monitor above or to the side will use muscles to hold your body in place and misalign your spine/etc. leads to fatigue/stress/long-term issues