On the contrary if you have to install cut tiles you should spread the thinset to the back of the tiles and install it with the cut edge pointing towards the inside corner.
How to tile outside wall corners.
This do it yourself video how to install tile edge trims on a shower outside corners shows how to install tile edge trim on a wall and curb outside corne.
The edge is fully glazed and is used to cover up both the edges of the two tiles that meet at an outside corner.
Space the two tiles consistent with the rest of the tiles generally 1 8 inch which will leave a 1 4 inch space at the corner.
All you have to do is to start installing wall tile on one side of the corner.
Spread the adhesive on the wall with a notched float and make sure the tiles are plumb use a spirit level to be sure.
Press the tile against the wall with the cut side facing the corner and the other edge next to the last full tile in the course.
1 lay out the tiles along the first wall that comes up to the corner.