The phrase 'all the room' is correct and usable in written English.
It can be used to refer to an entire physical space, or all the people in it. For example, "All the room cheered when he walked in."
That sound was all the room had.
I need all the room I can get".
We'd get all our meals free, all the room service.
But it doesn't leave me all the room I need to shape it.
By contrast, some of the more ethereal species deserve all the room they might need.
On occasional weekends in the country, I have all the room I want.
As he crosses the Pacific, he'll have all the room he needs.
The reducing atmosphere also plays an important role to remove all the room temperature oxides present at the surface.
As you start squeezing, literally what'll happen is you'll squeeze out all the room for the gas.
"He [Lordan] was riding, quite correctly, to give Saxon Warrior all the room he wanted to come out," Gosden said.
But the wedge shot, I had all the room short of the hole and I fly it past the hole.
