Period Separators in M5~M1

Thank for your team developing such useful trading software. I really like cTrader 3.7.
A question: I used to show "Period Separators",
But in M5~M1, the "Period Separators" line often disappear, when I move the chart a little bit, the line is displayed again.

I wonder if this design has a special purpose?
But I personally hope that the line can be displayed continuously, otherwise it is a little annoying to find where is the line XDDD.