How to undo title only?

How do I undo the title only in the outline, the undo button doesn’t work.

It seems to be some kind of formatting that makes all text in CAPS, I want to resume normal text.

I deleted this document and the same formatting still remains, please help.

About CAPS,try to double click the caps button.

About Title only, it is a toggle button. Undo is only used to correct type errors which do not contains toggle changes at present.

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Oh ok thanks for the solution.