Hi Andrey Suntsev,
Indeed, you can reposition it to best fit your view and presentation. For example, in a stacked bar chart, the mark labels are automatically placed in the center of each bar. However, you may want to stagger the labels so that the longer ones don’t overlap.
You can't disable marks' movements, but you can hide it if you want to.
More details in there: Show and Hide Individual Mark Labels
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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Thanks a lot for so quick response! I've got your overall idea. Thanks.