I found the answer to the problem and it just happes to be so easy to fix and here is how you fix ti
1-go to developer options
2-scroll down to you see apps right under apps you will see the Don't keep activities ( destroy every activity as soon as the user leaves it)
Make sure that there is not a check mark in the box. If it is checked uncheck it. what happens is when you leave the area where you change font it does not remember what you did.
I have fixed several of galaxy tabs with this fix



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