Here is a screenshot of the drop-down menu that appears with an arrow pointing to the Help Center.
If one of the Frequently Asked Questions does not address the standardization issue, then search for "standard date name" and the article will come up. You can also go to the article by clicking on this link to Entering standardized dates and places.
Carefully read and follow the instructions. The most important statement on this page is as follows:
Note: FamilySearch recommends you use the name of the place at the time of the event. This matches with sources and facilitates hinting. FamilySearch is working to connect historic names of places with their modern names.This is extremely important because it allows you, the program and other researchers to find records that match the individual being researched. Historical records are very often associated directly with the location as it was at the time an event occurred. This is particularly important in Europe and countries where the international boundaries have changed many times over the years.
The key to keeping your place names correct is in this statement in the article:
Instead of clicking the standardized place, click somewhere else on the screen. The system leaves the place as you type it but connects the place with the standardized place.This is really a simple procedure, but it is crucial to the way the program works. The answer to the question in the title is simple, it enables the program to find your ancestors.