Blade can be hit from any position (XCOM 2)

The ranger class has a melee weapon on its back. So that's it. When choosing a blade and then choosing an alien, we are shown the fixed position of our fighter upon impact. This position can be CHANGED as it is more convenient or profitable for you.
It is done like this: Choose a ranger in walking mode (That is, DO NOT choose a sword or other weapon, but simply how you are going to walk). Hover LMB (left mouse button) at the adjacent squares with the enemy and CLICK LMB to point at the enemy (It is very easy to lose the square you need, so make sure that this is exactly the place you need) and so, pointed at the enemy with A PRESSED key and a sword icon appeared on the adjacent cell with the enemy (in fact, this is the cell from which our fighter will hit) and then press RMB (right mouse button) without releasing the held LMB. ALL! Our ranger will run up to the selected cell and hit the enemy.
Without further ado: Hold LMB by selecting the desired square, then RMB without releasing LMB.
PS. I hope I will help many people, maybe I asked myself a similar question myself, because of not very favorable positions when taking with a sword.
Good luck to everyone with the resistance :)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ADDITION. As _Salar_ said, you can get by by simply right-clicking when the sword icon appears.