I have tried setting the mount config to true and false on both server side and client side, however when mounting the mount still kick the user out.

Are you using Fabric or Forge?

Hi, I am using Fabric. However, this might not be a bug at all - after repeated testing and feedback from players, I realized this config is for fetching mobs and for players to hike on.

I thought this was a setting for if Giants could mount on horses, boats and minecarts - I would like to request for one, but should I open a new thread? You may close this thread for now. Thanks!

So this is not currently possible to disable in v2.0.1 without also disabling some other powers. It is currently located under origins-plus-plus:giant/swim, but I will split this into a separate power for the next update.

In the next update, this power can be found at origins-plus-plus:giant/prevent_mount which can be disabled in the config.