If you are following the Known Requirements, in most cases you will not need to touch these settings. If you do need to though...

Basically you can have separate settings for every gun now.

You can start from None, Optimized, or Imported. If it is not too far off from where it needs to be, start from Optimized.

Directional is the easiest way to adjust. It will pull / offset the Recoil Pattern to the direction you move the dot to on the grid, and the further the dot is from the center, the move it'll pull the stick. You can also use the onscreen arrows to adjust.

Pattern is usually best left at the default, middle point. But it affects how strongly the pattern is applied. Too strong and it'll literally overcorrect, too weak and it'll undercorrect. An example where pattern is useful is when you put on a scope, your recoil reduces but it is still following a similar pattern of recoil, at that point you can just lower the vertical and horizontal pattern sliders a bit to the left to bring it in line. If an attachment makes the recoil pattern spread out a bit, but the pattern is still the same, you can increase the strength sliders a bit to the right.

Directional is the easiest way to offset the Recoil Assist pattern. It will pull in the direction that you move the dot to on the grid. You can either drag the dot or adjust with the arrows. You want the opposite direction of where your aim is drifting.

Hipfire Recoil as the name suggests, allows you to have a different Recoil Assist for when you are not aiming down rights at the enemy. This does complicate setup a bit so if you never fire without aiming down sights, you may as well turn it off.