maximum view tab sometimes not working

[gm649]

Hello
i set maximum view tab = 1, but sometimes it not work,
here is my settings :
- mode when open : fullscreen viewer
-maximum view tab = 1
open image in xnviewmp will open it in fullscreen,when i press f11 to exit fullscreen, i see that there are multiple tabs open ,which were the images i opened before
sometimes it happens, but i still cannot find exactly how to reproduce it
i will update here when i find how
i use xnview mp 0.98.0 64 bits on windows 10
Thanks