Chapter removal mkv

[zkab]

I have one mkv file with 15 chapters.
When I run 'mkvextract' all the chapters are shown like:

<?xml version="1.0"?>
<!-- <!DOCTYPE Chapters SYSTEM "matroskachapters.dtd"> -->
<Chapters>
<EditionEntry>
<EditionUID>801521038</EditionUID>
<EditionFlagDefault>0</EditionFlagDefault>
<EditionFlagHidden>0</EditionFlagHidden>
<ChapterAtom>
<ChapterUID>280084908</ChapterUID>
<ChapterTimeStart>00:00:00.000000000</ChapterTimeStart>
<ChapterFlagHidden>0</ChapterFlagHidden>
<ChapterFlagEnabled>1</ChapterFlagEnabled>
<ChapterDisplay>
<ChapterString>Overture</ChapterString>
<ChapterLanguage>und</ChapterLanguage>
</ChapterDisplay>
</ChapterAtom>
...

but when I try to remove some chapters with 'mkvmerge GUI' all in tab 'Chapter Editor' are grayed out and no chapters are shown.
I have Linux Mint 3.2.0-4-amd64 and MKVToolNix 6.1.0
How can remove some chapters ?

[pearlblack15]

In the 'input' tab under 'tracks, chapter and tags' box, deselect the chapters and remux it. That should remove the chapters!

[zkab]

I want to remove some chapters - not all of them

[pearlblack15]

In chapter editor tab, load the file. The program will analyse the file and list the chapters. From there you can select and remove the chapters accordingly. Later, save the file from Chapter Editor>Save/save as/save to matroska file (whichever you like).

[zkab]

Thanks - it worked just great