It's possible my version of Regression Learner is out of date (MATLAB 2021b). I notice other features described in the documentation (such as saving a session) which don't exist in the menus on my version.
Using regressionLearner app—how to add models
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I'm following this tutorial on how to use the regressionLearner app. At one point it says "Add medium and coarse tree models to the list of draft models. On the Regression Learner tab, in the Models section, click the arrow to open the gallery. In the Regression Trees group, click Medium Tree. The app creates a draft medium tree in the Models pane."
I cannot figure out how to do this. When I click icons in the Model Type gallery it changes the type of the existing model, rather than adding a new model of the selected type.
Screenshot:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1316000/image.png)
No doubt this is so obvious it is staring me in the face,,,
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