XnView Software

- Previous key tap ONCE AT A TIME (set to "Previous file") >> shows previous file (ordered by modified date). OK.
- Next key tap ONCE AT A TIME >> same, the other way. OK.

it show previous/next file not ordered by date but random


Nope. If you ordered the slideshow items (as mentioned above ...

Reproduce:
- Windows 11
- 1.8.0 x64
- NTFS HDD partition
- Have multiple directories merged into a slideshow
- Order the slideshow by any criteria (like "Modified Date")
- Slideshow options:
# Slide Show Sequence v2
UseTimer = 1
Timer = 1.25
Loop = 1
FullScreen = 1
WinWidth = 640
WinHeight = 481 ...