Hash marks dim in Word ruler

I have a Word doc (Office 365, Windows 11) set up with mirror images for the margins for the even and odd numbered pages. On the even numbered pages, the ruler's hash marks are visible. On the odd numbered pages, the ruler's hash marks are not visible (just the inch numbers are visible, not the hash marks themselves). When I use the ruler (using the double-sided arrow) to shift/drag the left margin on an odd numbered page, even a tiny bit, the hash marks appear. When I return the margin to the original spot, the hash marks disappear again. Also, just from a view standpoint, the position of the white section of the ruler shifts between the even and odd pages, which makes sense, given the mirror margins. I can't change the margins, since they are specific to the layout to publish a book. How can I get the hash marks on the ruler to remain visible under all conditions?