I have version 14.6.13, the Chrome version, I believe the same is happening with my desktop version, which is 14.8.5
I scroll to the page I wanted to remove and right-click on it, it shows the options " Undo..Redo......Select ALL" etc., but nothing about removing the page.
On the lower-left corner, there is 3 vertical dots, with the label " Page-1", if I right-click on that tab, there is a delete page option, but that would delete everything.
Perhaps my concept of a "Page" is different. I work on A4 size pages, so one diagram fits in one A4 page, if it crosses over another A4 page boundary, that would print out in two or more pages. The empty pages I refer to are the extra empty A4 page created when importing another darwio file, but have nothing on them.
Hope that clarifies the situation.
cheers