Hello
in Word 2016, I add a "Line arrow" by following process :
Inser --> Shape --> Line arrow

Then I'm trying to make the arrow horizontal by manually moving its extremity. But it doesn't work ....

The only solution I found is :
right clic on the arrow --> "Other place position" --> Size --> I enter a numeric value in the line "Rotation" --> OK
At that moment, it is possible to adjust manually the extremities of the arrow to get it horizontal.

But this process is really too long.

Have you got another solution ?