Set the column width in the code to open the displayed column width different

[fwren]

I use

QXlsx::Document document;
document.setColumnWidth(1, 100);

in the code

But the width displayed in the file is around 700, is this coincidence?

[fwren]

I seem to realize that the default unit for setting the width in .xlsx files seems to be the character width, which is different from what I think the actual width is. Could this be the cause of the situation?