According to 5e rules:
Moving Around Other Creatures
You can move through a nonhostile creature’s space. In contrast, you can move through a hostile creature’s space only if the creature is at least two sizes larger or smaller than you. Remember that another creature’s space is difficult terrain for you.
Whether a creature is a friend or an enemy, you can’t willingly end your move in its space.
If you leave a hostile creature’s reach during your move, you provoke an opportunity attack, as explained later in the chapter.
My most hated enemy right now is the ally standing in front of my character. It feels really bad to have your Warrior go first only to waste a bonus action jumping over allies to get to enemies. The Ranger's Giant Spider is just a giant roadblock for your allies, and an overall hindrance in most combat spaces. Your party members get in the way constantly and are always forced to walk around each other, often times into traps because you switched to the Rogue to disarm them. Just make them walk
through each other and we can RP as them walking
by each other like 5e intends. No more musical chairs. No more extra hassle for having a chain Warlock and a bm Ranger in the same party. I dread thinking about this existing when animate dead becomes a thing. A Party Formation feature like from Divinity wouldn't address this issue and only helps prevent your Warrior from starting behind your Warlock (but would still be very very welcome please add that).
Love the game, keep up the good work!