Here is what the documentation says:
"Max Symbols in
It is possible to specify an upper limit to how many data points that will be
displayed with symbols. The default number is 100. This feature is only useful
in line charts and combo charts, for expressions with both Line and Symbol
I have run some tests and here is a example to understand the behaviour of this option:
- Create a line chart
- On your expression, check option "Symbol"
- Set the value Max Symbols in Charts to 10
- If you chart contains less than 10 points, you will see the symbols. Otherwise, QlikView will just draw the line.