The leader connection is only to the side of the text (left or right depending on how you place the label).
If you rotate the label 90°, you will find the connection also rotates.
But if you want horizontal text, the leader connections will also be horizontal.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10