Button for switching from structuretree to history page.
Helpful for in-game history page switch when in structure tree.
Most important for getting civ information and bonuses read in-game.
Best when random civ.
In gamesetup also switch to history page from structure tree (via info button) possible then.
For fast relookup, when history page/structure tree closed in gamesetup, it reopens same page again.
Switch button below next to close button on history page and structure tree page.