text size is diffrenrent (LOCKED: Duplicate Post)

the size of the text is different, it is smaller than i selected (Korean language program).
text size numbers are same, you see the same settings. But it's different in size.
Documents that fit the font size of the top picture are old documents
The small picture on the bottom is a new document that I made.
When i create a new document, the letters will appear small. I don't know why.
Is there a menu where I can set the all font size?