The two Power BI report pages below show examples of a bad and a good page design. On the left page, the report builder made a number of mistakes that can lead to misinterpretations or in the best case makes it difficult for the user to extract the needed information. Those mistakes are including non-relevant visuals, confusing placement and overlapping of the visuals, excessive use of colours, using wrong visuals with incorrect granularity of data, poor choice of slicer format, inconsistencies, etc.
All those mistakes were corrected on the page on the right hand-side, where all the elements are intentionally placed with pixel-perfect alignments in order from the most important and the highest level information to the less important and more detailed visuals. Finally, a well designed page like the one on the right will have a sense of calmness to it, in contrast to the one on the left that leaves the users with the feeling of chaos and frustration.