are you using OXCE?
I think that no, I just installed OpenXcom nightly build.
Is that option not available in OpenXcom? because I've seen it mentioned also on
https://www.ufopaedia.org/index.php/Hidden_Features_(OpenXcom) which seems to be about "OpenXcom"
(I reply in this forum because that is the forum thread I found searching for debug mode, didn't noticed it's in OXCE subforum)
Actually I am confused now, how OpenXcom and OXCE differ, it seems OXCE is a fork? but both are actively developed it seems.
I searched internet for few moments and I do not see the intruduction - what OXCE *is*, e.g. not explained in
https://openxcom.org/forum/index.php/topic,6586.0.html Where is the introduction page of OXCE atually?
If they are on-purpose different, than is one a "superset" of the other? and if yes, then wouldn't it be better to develop one fork only?
If I am going for "playing close to the original DOS game but with a non-sucking interface and without some glitches" then "just" OpenXCom is the right choice?