Hallway would look strange being horizontal since it seems to be not very wide.

I have solid hardwood floors - site finished. They are all installed perpendicular to my floor joists = it all runs the same direction.

For LVP, my understanding is that the general rule is to install the flooring lengthwise along its longest (and straightest) wall or in the direction of the room's main source of natural light. However, I've never had LVP - but that's what I've read on Houzz in other discussions.

Without considering @dani_m08 's input about the light rule for LVP (I've never had LVP, and never heard this rule), I would say everything should run "left to right" in your floor plan above. I think that would have the flooring running the length of your hall.

Even with LVP, floor joist determines direction of flooring, for rooms and hallways. Lay it continuos whenever possible.

Unless a reason?

Would advise not to run the flooring in a hallway perpendicular. It will look odd to have so many short segments of flooring that runs from side to side.

To me layed exactly like real wood is best and that usually means think of the joists and the planks layed lengthwise in a hallway for sure not short little pieces across the hall. The flooring sometimes needs to be in a different direction in rooms off the hall, I see not reasomn for transition strips in the spaces seen all at one time so as Jan posted is what is best.

I would run it front to back everywhere if that will be perpendicular to the floor joists.

Bet me he's on a slab ? : )

I am on slab, you are correct @JAN MOYER

Can you explain why you had two lower bedrooms horizontal but the two upper bedrooms vertical? Thank you.

Thanks, @Patricia Colwell Consulting . I am trying to figure out if there is logic behind deciding which bedrooms you would choose to run in a different direction.

Jan, I'm actually glad you said that bc I'm on a slab over here wondering wtf floor joists are and are my floors installed correctly lol

^^LOL !!!!!!

@JAN MOYER I will write you a good review lol!

So Jan, if I decided to just have everything go horizontal it would not look too bad?

It would definitely NOT look "bad" : )