Set the Fuji to MF and assign a back button focus. Point the camera at something the distance away that you want to focus at. Press the button.
Easy, simple and quick and you don't have to look at the camera. Really can set the distance using the group and and how much in front of you you point the camera.
Shawn
This.
Or
Use some version of the virtual DOF scale to set zone focus as described by
Greg Maslak above.
It is possible to set the AF parameters such that unintended focus areas are not an issue. Unlike much older FUJIFILM bodies and lenses, the newer systems are fast and controllable. With XF lenses it is possible to use the AF manually. This is not quite the same as using the lens focus ring and DOF scale with non-XF mechanical focus lenses or the on-screen DOF bar with XF lens.
Details about X-Pro2 focusing can be found
here.
AF + MF to fine-tune focusing
In the Autofocus Setting menu, turn AF + MF on. You can then press the shutter button halfway to activate AF and use the manual focus ring to fine-tune your focus. This is useful when trying to focus on a complicated subject that is difficult to autofocus, or when you want to focus on a specific part of the frame.
Making best use of the AF Lock
Fix focus while pressing down or pushing the AF-L button on the back of the camera. Pre-focus and wait until the right moment to take a picture. Exposure settings may be adjusted even after locking the focus.
Instant AF in the MF mode
Press the AF-L button while shooting in the MF mode to autofocus on a subject within the focus frame. This eliminates the need to rotate the focus ring from near the shortest shooting distance position to infinity and achieve a quick transition back to MF. In the Autofocus Setting menu, you can specify to activate either AF-S or AF-C in Instant AF.
Use MF Assist
If you choose focus peaking, it is easy to visually determine if true the focus region succeeded in finding the intended focus object. For low contrast focus targets. the Rear Command Dial crops the true focus region to a predetermined enlargement.
Three XF lenses are designed for pre-set focusing.
With the XF14mmF2.8 R, XF23mmF1.4 R and XF16mmF1.4 lenses, pull the focus ring toward the camera body to instantaneously switch to the MF mode without having to adjust settings on the camera. Perfect for taking snapshots with at a pre-set focusing distance.
With the X-Pro2 I almost always use focus and recompose in OVF mode for street/documentary work. Of course, when I recompose the aperture must be narrow enough to accommodate the difference between the selected focus distance and the object of interest in the recomposed frame. This is similar to how I used film RF cameras. The difference is I use AF manually to select a small focus region at the center of the finder instead of turning a lens focus ring. Focus is estimated with Instant AF in MF mode or AF Lock. The focus region size can be adjusted to match the size used by your favorite optical RF focus patch. Using a focus region size optimized for lens focal length and, or the scene at hand can be worthwhile.
To be complete, there is a disadvantage to using AF manually with newer FUJIFILM cameras. One has to understand how the AF Menu settings work together. Then one has to practice how to force AF manual operation to operate as one prefers to estimate focus. This process can be simple as
Greg Maslak and
Shawn point out. Or it can be more complicated in some circumstances -
e.g. when a narrow DOF is appropriate.