An "
upper left display for changing aspect ratio"
To change aspect ratio...
...rightclick > Video > Aspect ratio > ...
(or use the shortcut keys as mentioned there.)
Alternatively you can "
cycle aspect ratios" by (repeatedly) depressing key [A].
Then indeed the aspect ratio selected is shown a few seconds in the upper left corner of the video window. Maybe that's what you mean?
This unless you've redefined this shortcut key of course (under rightclick > Options > Preferences > Key definitions & WinLIRC > ...)
Further make sure that "OSD" hasn't been disabled otherwise the selected aspect ratio will
not be displayed of course.
To verify: rightclick > Options > Preferences > Video > [OSD]
"[
v] Enable OSD"
Also,
depending on the rendering mode you're using, the option
"[ ] Draw OSD messages to overlay" should be either switched on or off.
