Hornbeam has pleated leaves that have smooth edges, maybe it's a hornbeam? They are commonly imported from Korea, etc.
Keeping them out of the sun after repotting presupposes that they have leaves.
The leaves continue to 'transpire' (sweat) but if the roots have been cut, they can't take up water to supply to the leaves. So putting them in shade or dappled shade helps until the roots regrow.
However, with this tree, you want warmth on the roots to stimulate them to grow.
Now, (she says in her best Mommy Voice) don't mess with it. Let it recover. It really would be better outside, but if you have to keep it in, make sure that it is not near a heater vent. A tray of pebbles with water, under the pot (but not allowing the pot to touch the water) may help raise the humidity in the immediate area. Wouldn't hurt. You could use aquarium gravel or something.
Good luck!
Joanie