How to determine the handedness of a sliding patio door?

Standing outside, close your patio door;
Locate the moving panel;
When opening the patio door, if the panel moves to the left, you have a left handed patio door;
When opening the patio door, if the panel moves to the right, you have a right handed patio door;
Our outside handle is not handed, it works for both left or right handed patio door. Except for some special cases where the outside handle is specially made.
Our inside handle is always configured according to the patio door handedness. It can be easily converted if desired.

The handedness of a patio door is according to the opening direction of the panel, not closing action.

For example, if your patio door is a left handed one, the inside handle should be a left handed one in the "handle title".

If you stand inside the house looking at your left handed patio door (determined in above), the inside handle will be suitable for "right hand" operation, but it's a "left handed handle in the title".