Suggestion for IDE v2.0

In the menu Home / Platforms / Embedded there is a symbol for installing,
even when the platform is already installed. (Atmel AVR is already installed)

I think it should look like in the Home / Platforms / Installed menu, when the platform is already installed.

You can install different versions of the same development platform. Click on platform “card” and take a look at dropdown list with available versions.