How do I access the `aptitude why` functionality through Aptitude’s interactive interface?

I can check why a package is (to be) installed using the command:

aptitude why <package-name>

I like to manage packages using Aptitude TUI (aka ncurses), i.e. running:

aptitude

Is there any way to show the information of aptitude why from within this interface?

If you start aptitude in its gui (with ncurses) you can browse packages. While you're on a package name, hit I and see information in the status bar. Hit I until you are shown something like

i     kubuntu-desktop Depends anacron

or

unable to find a reason to install <package-name>

That's the aptitude why

Here is a screenshot

Launch aptitude in interactive mode.

When you are displaying the information of a package in aptitude's interactive mode, you can press the I key to switch between Description, Related Dependencies and Why Installed in the information panel.

You can make this more obvious if you enable displaying tabs in the information panel:

Hit Ctrl+T to activate the menu, navigate to the Options menu and select Preferences.

Search for this option:

[ ] Display tabs for the information area

Activate it by pressing Enter or Space when it is selected. It will get checked ([X] ...).

Hit Q to close the options tab.