Currently, the comment indicators are opaque squares in the upper-right corner of the cell. This sometimes blocks a fair amount of the right-most digit in the cell.
With a quick glance, is that 13 or 15 in cell A1?
Bug #89182 removed the extra white border around the cell, but does not improve the overall design.
Change the comment indicator from a square to a right triangle. This will dramatically reduce the obscured area.
Can also add an alpha value to the comment indicator to make it translucent.
Adding the ability for the user to set the color of all comment indicators would be an additional improvement. Adding the ability for the user to set the color of EACH comment indicator individually would represent a substantial improvement.
We may also want to allow the user to change the location of the comment indicator within the cell. Similar to specifying the color, changing it globally would be an initial step, and changing it individually per cell would be a more substantial improvement.
Setting to new
Update: Issue still present in LO Calc 5.0.2 (release).