There is an indicator line in the ruler when moving the cursor around the page, but as soon as you drag a page guide onto the page, that indicator disappears just when you need it most!
Screen Recording 2019-04-25 at 5.10.33 PM.mov
WHY? Having that indicator line would be extremely helpful when placing guides on the page based the ruler. I've noticed that Affinity apps have really terrible interface glitches, many of which are reported and then never fixed or take years to fix. Such as this...
Displaying white text against a light gray background when you click into a field is bad enough, but the text is also duplicated several times and all messed up. I reported that several versions ago in Photo, and the bug is still there.