To set up for capital letters start every sentence

set up capitals at every sentence.

And what is your problem? You can’t or you’d like to?

Try to have a look at Tools>AutoCorrect>AutoCorrect Options and go to Options tab.

There are various settings there. Either check or uncheck the boxes labelled -Capitalize first letter of every sentence*.

Caution! A sentence start at beginning of document and then after punctuation. If you end a paragraph without punctuation, Next paragraph will not start with a capital letter.

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