I tried to draw polygon by using add polygon. It should be a straight polyline and then become a polygon but it turns to a curve line like arc (circular line) so that I couldn't draw a polygon. It's very strange. I download QGIS 3.18 and the result is the same. I don't know how to solve this problem.

enter image description here


You have activated the icon Digitize with curve on the upper left. De-activate it:

enter image description here

  • I de-activated the icon and it works. Thanks Babel.
    – Sura Pong
    May 19 at 2:43
  • Great! As a new user, please note that this site tries to avoid thank you messages. It encourages you to accept answers (hit the checkmark) that were helpful and/ or upvote them.
    – Babel
    May 19 at 5:18

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