Hi Øystein,
Thanks for clarifying! Now, we understand what you meant by proportional size.
The classification tries to create buckets and puts your data in each bucket based on a predefined range of values that categorize these buckets. These options are configurable through classification types and number of classes. For example, in your case with Qty values of 1, 5, 10, 20, 100. The Map for example tries to create 3 buckets "<20", "20 to 50", ">50". So 1, 5, 10 get put in the first bucket (<20), 20 gets into the second bucket and 100 gets into the last buckets. Each bucket is assigned a proportional symbol size which means that 1,5 and 10 will have the same symbol size, 20 has a slightly larger symbol size and 100 has a larger symbol size. Also, the documentation that you refer to for the Size based classification lists out incorrect classifications. Manual breaks and None are not available for Size based classification.
We will certainly take your input about the proportional symbol size back to the team for consideration.
Thanks,
Alagiri