Making the width and height of ChartView the same size as the project window (640x480) allows the text to display in full. Assuming you're not restricted on the size of your ChartView of course.

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@ChrisW67
Thanks! It work like a charm.

For the reason to why I was using QLabel, well I'm mostly testing for stuffs. I'll switch it up later.

I've decided to report this issue as a bug here.
Was you able to reproduce the issue ?

Normal C strings don't support unicode, so doing QString("\u2060") will give a compiler warning saying "C4566: character represented by universal-character-name '\u2060' cannot be represented in the current code page (1252)", and will replace the \u2060 characters with question marks.

Instead, it works to do:

QString("Défaut suspension: Limitez votre vitesse à 90km") + QChar(0x2060) + "/" + QChar(0x2060) + "h"

Or, if that's too difficult to read, this also works:

QString("Défaut suspension: Limitez votre vitesse à 90km\1/\1h").replace('\1', QChar(0x2060))