Change Model In Game with Widget Buttons

If you are looking for a drop down menu button solution, an enum on the blueprint actor and a combobox in the widget would work well for multiple models.
If it’s just two, a boolean on the blueprint actor and a flip flop on the UI button will get this done in no time.
For the slider, you truncate the float value into an integer and go for the solution suggested by @Everynone.
The Widget sliders have “steps” and I assume you would put that to 1.0 to keep it “snappy.”

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