Comment 2 for bug 1436690

If you are saying that you cannot put more than 139 icons on one column, then you have probably run into a limit of the Qt toolkit that calibre uses. The toolkit cannot create an icon wider than 32767 pixels (which of course is *much* wider than any screen I know of). The individual icons for a column are combined together into one displayable icon. If the result is wider than 32767 pixels then the icons will be displayed incorrectly. This will not change. For standard-sized icons (128x128) the maximum number of icons per column is 252. If your icons are wider than 128 pixels then the maximum will go down.

You cannot see more icons in a column than will display in the width of the column. There is no scrolling inside a column. That said, seeing 139 icons in one column would require a screen more than 18,000 pixels wide so I suspect this is not what you are saying.

If you are saying that only 139 icons can be displayed across all columns then I cannot repeat this. My test successfully displays 492 icons.

If you are saying that there is a small limit to the number of rules/conditions one can apply then I cannot repeat this. My test uses 10 'composed' rules to generate an icon set for a column, and all the appropriate icons are displayed. I know of no reason other than complexity that one cannot use many more rules than 10.