I tried to reproduce the bug. For me it's working as expected.
Could you please try again?
If it is still not working for you, could you please export the survey and attach it?

Maybe it's just a version conflict. In master branch (version 4.4.9) it works.

slider_in_preview_multipe_numeric.png (28,843 bytes)   

slider_in_preview_multipe_numeric.png (28,843 bytes)   

advancedsettings_slider.png (85,461 bytes)   

advancedsettings_slider.png (85,461 bytes)   

Still doesn't work. Export of survey attached. The question concerned is test1.

Thanks for attaching the survey. I checked the survey. The problem is the following:
If you want to use the slider, you have to turn "Use slider layout" to "on" and save the question again. Afterwards please try again. The slider should be visible.

Please let us know if this helped you out.

Greetings
Patricia

turn_sliders_on.png (61,519 bytes)   

turn_sliders_on.png (61,519 bytes)   

sliders_working.png (16,079 bytes)   

sliders_working.png (16,079 bytes)   

Surely related to this fix : https://github.com/LimeSurvey/LimeSurvey/commit/1d7b620f7dca5b79171c9c5d844cffe2254ed9dd

The problem is certainly NOT that I have forgotten to set "Use slider layout" to On. See attached screenshot. However, if restoring a survey from the export shows that the setting is Off, that means that somehow the user interface is showing "On", whereas the setting is really "Off". Maybe there is also an issue regarding https://github.com/LimeSurvey/LimeSurvey/commit/1d7b620f7dca5b79171c9c5d844cffe2254ed9dd but that seems to be an entirely separate issue.

Screenshot from 2021-02-19 09-44-17.png (71,429 bytes)   

Screenshot from 2021-02-19 09-44-17.png (71,429 bytes)   

but that seems to be an entirely separate issue.

Not it's THE issue : Save "Y" on database, show On with Y but check 1 when do survey …

Did you try with 4.4.8 version ?

Just to be clear, the instance in which the problem occurs was never created from any export. Let me say further that the original installation was done by someone else and I have no control over what was done and what errors might have been encountered. All I know is that given the fresh install presented to me, I created the survey from scratch and the slider does not appear.

For this and other reasons, I have reverted to a stable version of LimeSurvey ( 3.25.10+210128). So, if I am the only one who has this problem in an unstable version that is already out of date, perhaps there is little point in pursuing the issue. But that's up to the maintainers.