Since Half Sword does not have a reset to default button yet, here is a quick tutorial on how to get the default settings:

Step 1: Go to the SaveGames folder C:\Users\name\AppData\Local\HalfSwordUE5\Saved\SaveGames\

Step 2: Delete Settings.sav

Step 3: Open Half Sword, your settings should now be reset to default

Hope this helps! I also created a video if you find it easier to understand!