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How to lose the square symbol in the upper right corner of a number when entering a mathematical formula? How to lose the small 2 in the upper right corner of the number?
Internal words

The shortcut key of superscript is to press Ctrl+Shift+= again in English input method state to restore.

Please note that this must be done in English input mode. ..

You type it first. Select the words to be superscript ... and then select Format ... Font ... and select superscript in the menu bar.