Why does Word open in size 10 font if the standard is 12?

Why does Word reverse quotation marks when added before periods? Is this ever grammatically correct? For example I type a sentence and then a period- . Then I attempt to put quotation marks around the last word before the period- “period”. The result is a word with both quotation marks facing the same direction (that of the first).

There is also the issue of words typed after quotation marks and periods not being auto capitalized, “like”. this.

I am not complaining; I just cannot understand why the system was set to operate in this manner.