I was curious why this version
here has them. And also there is a screenshot in the manual which is also with those five buttons.
You're right. The manual and that Let's Play video do show additional buttons, one of which allows you to view faction attributes. However, I couldn't figure out how to reproduce those extra buttons in the GOG version of SMAC.
The extra buttons appear in other versions of the game when running at low resolutions, 800x600, say. You can force the game to run at 800x600 by editing the Alpha Centauri.ini file as follows: In the [Alpha Centauri] section of the file, add the line
video mode=800 and delete the line
directdraw=0 (if present). In non-GOG versions of the game, this change results in additional buttons being displayed in the
CHOOSE A FACTION screen, but not in the GOG version. (BTW, the ini file for the GOG version is located in the folder
C:\Users\(user name)\AppData\Local\VirtualStore\Program Files (x86)\GOGcom\Sid Meiers Alpha Centauri.)
Perhaps GOG stripped out the low res version of this screen from their release.
Thanks for bringing this up. It's a new (or perhaps forgotten) piece of trivia about the game. (The Alien Crossfire add-on does have an additional button in all resolutions that allows you to view faction abilities.)