How to remove the blue underline in word?

Click the blue wavy line with the right mouse button, and the setting menu will appear, suggesting that there may be grammatical errors in the word. Click Ignore to cancel the display of wavy lines.

End step:

1. Click File-Options.

2. Click "Proofread".

3. Uncheck all four options of "When correcting spelling and grammar in Word" on the right.

After clicking OK, the red and blue wavy lines in the document disappear.