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|Showing Small Multiples in Power BI charts|
|Small multiples are mini-charts shown in a two-dimensional grid, with each chart showing the state of play for a different field's value. After a number of improvements small multiples have finally emerged from preview!|
This exciting feature is now integrated into Power BI!
Small multiples allow you to show the same chart for each value in a dimension (so here we're comparing sales by region for each of 5 habitats).
The above screen-shot shows that small multiples look better if you have a non-prime number of small charts (6 charts would have looked much better, as we wouldn't have the strange empty bottom-right space).
To create small multiples, start with a normal line, bar, column or area chart:
Make your chart quite big - in a moment it will have a lot of little baby charts to show!
Drag the field whose value you want to compare for each small multiple onto the Small multiples field well card:
Drag a field into this area of the field well.
Our chart has 2 rows and 3 columns. To set how many charts will appear in your small multiples grid, change these options:
In the Grid layout card, set the number of rows and columns. Any unused "boxes" will be left blank.
Bear in mind that the Y axis titles and labels will appear once and once only to the left of your small multiples, and the X axis titles and labels once and one only below them:
The axis titles and labels shown in the red boxes above are NOT part of your small multiples; they're part of the containing chart visual.
Small multiples look better (I think) with the titles below each chart:
Here we've moved the titles below each chart.
It's easy enough to move your titles:
In the Small multiple title formatting card, choose where to position the titles for each mini-chart.
You can control how small multiples appear using more options on the Grid Layout formatting card:
Most of the options control how (or whether) lines between the small multiples appear. By setting the inner and outer row and column padding to 0, as here, no other colours show through apart from the background colour you set for each small multiple.
You can set conditional formatting for the background colour of small multiples in the usual Power BI way:
Here the background colour of each small multiple has been set to the value of a field in the Habitat table.
However, if you then try to customise the colour formatting of the data series (shown in red in the screen-shot above) you seem to lose the conditionally formatted background colours.
You can sort small multiples using the usual visual header icon:
There's a separate menu option for sorting small multiples.
The sort menu includes any fields used by your visual, including (for example) any measure that you've created and added as a visual tooltip.
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