Right, left or double arrowhead appears after updating to 7.1.3.2.
Duplicate of https://ask.libreoffice.org/en/question/312932/libreoffice-writer-now-pops-up-an-arrow-while-i-am-editing-that-changes-text-alignment-if-i-click-how-do-i-to-turn-off-this-annoying-feature/ Please delete that and continue here.
Do you mean version 7.1.3.2?
Please, edit your question to describe the “arrow” or post a screen shot/photo of the screen.
Thank you!