Size down the wide of Interface Statistics coloums

[Snobs76]

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Hello just a simple question. for my screen the "Interface Statistics" is to wide. If I close the left panel to the small size the "Interface Statistics" fits into my layout. But I want to have both the expand left panel and the full Interface Statistics.
A solution would be to make some smaller coloums for that, but I dont know how that works and maybe someone can help me to make it a little bit smaller. I put ascreenshot below.

Thank for advance.
BR
Sascha

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