A family of Microsoft on-premises document management and storage systems.
Hi @CM Terry ,
According to my research and testing, you can only change the width manually with the CSS but not able to make the width autofit by the text.
Change a particular page:
Open the page where you want to change the quick launch, Edit page and then from the ribbon click on Add web part and from Media and Content and then select Script Editor web part.
Then copy the following CSS to the web part.
<style>
#sideNavBox{width: 500px !important;}
#contentBox { margin-left: 540px }
</style>
NOTE: The value of width must be at least 40px smaller than the value of contentBox.
And then, you can see the width of quick launch has been changed.
If you want to change the width of quick launch of whole site, you can add it to master page.
Thanks,
Yanli Jiang
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