Certain drawings are not listed as "pages" - how do I print these?

[mmo]

I have a Visio-Files that contains four drawings (or tabs). Strange enough, only the first two are shown in the print preview. And also, when I click on the tabs, on the first two I see the text "Page 1 of 2" or "Page 2 of 2" in the lower left corner of the status bar while on the other two that status bar area remains empty.

It thus seems that for some odd reasons the other two drawings are not considered as "page". Why is that so and how can I print these?

This is using "Visio® Plan 2 MSO (Version 2306 Build 16.0.16529.20226) 32-bit" on Windows 10.