This is not something a developer has direct control over. Qlik Sense is optimising the chart based on the data and the available screen real estate. This is part of the responsive design and smart visualization capability that ensure optimal display on any device/screen size.
Please see below on how the labeling changes on the top centre chart based on changing the aspect ratio and size of my window.
This is automatic based on the responsive nature of the charts. If you turn on labels on data points and use a stacked bar chart and color by that dimension will display the data label as such:
Here is the Capital Management Example:- full screen
Notice many of the label light-blue boxes.
Hope this helps.
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