You might want to look at the Collision Bounding Box of the character, most defaults use a capsule with a large margin. Create a simple mesh that can be applied to reduce the margins. I can see that the ‘doorway’ doesn’t use a lot of hulls to create the opening, add another 4 vertices may also help, to form a smoother arch as opposed to a triangle.
In the box below the selection box, where you have chosen Use Complex as Simple, drop a copy of the Root mesh of the character in there. The engine will simplify that mesh so it matches the character and not some capsule.
Then there is the Collision engines Margin buffer added to that. Think of your character wearing a tall top hat.
I do that all the time, for Tree Meshes, using a simplified mesh of the trunk and branches, not leaves, for collision.
I am not sure if you can edit the capsule in Unreal, to make it shorter. Alternatively, use simple boxes as collision for your walls, with nothing over the doors, so the thing stopping them from passing through, will be the actual door collider itself. You don’t need collision above the door itself. That will negate the editing or swapping of the character collision capsule. Oh it will also lessen the camera hitting you in the head each time the player passes through.
Just a thought.