The motion setup for Kingdom Come: Deliverance 2 is built around three combat Links (see the Link Editor Overview and Keyboard & Mouse Recording for how to edit them):

• Swing-right ready: strike a right-swing ready pose; the output is a rightward relative mouse movement with the behavior set to "Spam", which keeps pulling your attack direction to the right
• Swing-left ready: the mirrored pose, with a leftward relative mouse movement, also on "Spam"
• Thrust: a two-hands-forward thrust pose; the output is the left mouse button with the behavior set to "Hold" — drop the pose to release

Relative mouse movements are added via the ▽ output menu next to the recording button > "Add Mouse movement" > "Relative movement"; double-click the step in the timeline to adjust the distance (i.e. how fast the swing direction turns).

You can install a permanent 1v1 mod — recommended by community member Xiang.
https://www.nexusmods.com/kingdomcomedeliverance2/mods/167