Improvements to TMDL model view

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Power BI Desktop updates for May 2025 Part three of a five-part series of blogs
A month which sees minor changes to line segments, Azure maps, calculation groups and TMDL model view, and major changes in preview for Copilot and something called "translytical task flows". Changes introduced in the May 2025 Power BI Desktop update Copilot changes within Power BI, and why we're not covering them Improvements to TMDL model view (this blog) You can now change the colour of individual segments of a line chart You can customise what appears on the base layer of Azure maps

Power BI Desktop updates for May 2025

Part three of a five-part series of blogs

A month which sees minor changes to line segments, Azure maps, calculation groups and TMDL model view, and major changes in preview for Copilot and something called "translytical task flows".

Changes introduced in the May 2025 Power BI Desktop update
Copilot changes within Power BI, and why we're not covering them
Improvements to TMDL model view (this blog)
You can now change the colour of individual segments of a line chart
You can customise what appears on the base layer of Azure maps

Posted by Andy Brown on 04 June 2025

In this blog

A refresher: using TMDL view
Renaming columns
Viewing property tooltips and intelligent fixes
Formatting your code

Before we look at the improvements to TMDL view, a quick reminder of what it is ...

A refresher: using TMDL view

TMDL view provides a new(ish) way to see the structure and content of your semantic model (in English: your data tables and the relationship between them).

You can go to this view for any report by clicking on this icon.

You can then drag any table into the main view to look at it in more detail:

Make sure youi've clicked on the Model tab as shown above first. Here I've chosen to look at the Centre table.

Renaming columns

You can now change the name of a column property (previously you could do this but without additional work on your part this name change wasn't retained):

Here we've changed the name of this column from SquareMetres to AreaSquareMetres. When you click on Apply this new name will be saved within your model.

Viewing property tooltips and intelligent fixes

You can now hover over any property to see a tooltip about it:

These look remarkably similar to Visual Studio Code tips for Python properties!

You can also now apply quick fixes to (for example) mistyped properties:

In this example you could click on the Quick Fix link or press Ctrl + . to correct the properrty name shown to formatString automatically.

Formatting your code

You can click on the Format tab on the ribbon (or press Shift + Alt + F) to format the lines of code making up your model:

However, all that this seems to do is remove blank lines that you've added!

It's amazing how far Power BI Desktop has come! There's no need any more to reference external tools, and it's getting easier and easier to document data (sorry, semantic) models.

Parts of this blog
Changes introduced in the May 2025 Power BI Desktop update Copilot changes within Power BI, and why we're not covering them Improvements to TMDL model view (this blog) You can now change the colour of individual segments of a line chart You can customise what appears on the base layer of Azure maps