Domestic Government

From EU3 Wiki

The Domestic Government interface screen is found on the sixth tab of the Domestic Management interface. This screen shows your current government form, and allows you to change this.

In the middle are the boxes showing your country's national ideas. If your government tech improves to allow a new idea, this is where you choose it.

At the bottom are your domestic policies sliders, where you can adjust your politics. If your government form limits your sliders, this will show as a red arrow like in the top slider in the image.