B5 and margintoc

[Neogene]

Hi,

I'm using the following document class which uses B5 document paper format, twosided:

\documentclass[ b5paper, fontsize=10pt, % Base font size twoside=true, % Use different layouts for even and odd pages (in particular, if twoside=true, the margin column will be always on the outside) %open=any, % If twoside=true, uncomment this to force new chapters to start on any page, not only on right (odd) pages %chapterprefix=true, % Uncomment to use the word "Chapter" before chapter numbers everywhere they appear %chapterentrydots=true, % Uncomment to output dots from the chapter name to the page number in the table of contents numbers=noenddot, % Comment to output dots after chapter numbers; the most common values for this option are: enddot, noenddot and auto (see the KOMAScript documentation for an in-depth explanation) %draft=true, % If uncommented, rulers will be added in the header and footer %overfullrule=true, % If uncommented, overly long lines will be marked by a black box; useful for correcting spacing problems ]{kaobook}

And a chapter which starts with:

\setchapterstyle{kao} \setchapterpreamble[u]{\margintoc} \chapter{Fondamenti di matematica e fisica} \labch{math}

\section{Materie tanto interessanti quanto poco apprezzate} \labsec{mathintro}

...

The problem is that margintoc displayed on the right showing chapters/subchapters titles exceed the page margin, how can I reduce the left margin/padding of this content area?