Actually - the game itself is not trying to run as administrator.
The game is trying to get some libraries installed which it requires, and this requires administrator access. Once the libraries are installed, the game will run in user mode without elevated privileges.
If you read the popup, it should be clear that it's the Steam client requesting the privileges, as it is this that is trying to install the libraries that Civilization VI needs.
Now, one reason why you may need to do this more than once is because the game is fresh out, and there were probably a small number of minor day one updates coming out in quick succession. Any change to a library requirement can cause the request for elevated privileges. (Personally, I've been asked this only twice, out of at least a dozen starts of the game from Steam over the weekend).
However - there are reports of other games getting stuck continually asking for the VC Redistribution package to be updated on startup.
https://www.google.com.au/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8&client=ubuntu#q=steam+keeps+installing+vc+redist
This seems to be some kind of client data cache issue with Steam.
The game crashes when exiting to desktop while in a game. Here are a couple of methods.
Method 1: Exit to the main menu instead of quitting to desktop from a running game.
Method 2: If Stuck!
Here is a method to force the civilization game to close by ending its process.
(Bring up task manager)
Press CONTROL-SHIFT-ESC
OR
CONTROL-ALT-DEL and then select it from the list.
You may need to click "More Details" at the bottom if that is showing as an option.
Goto details tab
Find process CivilizationVI.exe
Right click, End Process
Perhaps to be done now as it will help later as I have had the task manager appear under the game (dumb).
Bring up the task manager.
Under options menu, enable ALWAYS ON TOP
Once you have done this once or twice or know how to use the task manager, it will become second nature.
Best Answer
Cities under siege will not regenerate their health each turn, making them easier to capture.
To siege a city, every tile immediately adjacent to the city needs to be under the attacking players zone of control.