I have used cameras for a long time, none of them weather sealed, without any damage from water or dust.In fact I don't recall it even being an issue.But now I am deciding between an xt2 and xt20 ,mainly on this basis and the $700 price difference.I will never be out in the rain with this gear, but it will be exposed to ordinary dust, and perhaps high tropical humidity.I am leaning towards the xt20.This has perhaps been covered before, but I can't find a search function.
Were you trying to set the ISO above 6400?
The display says you have the mechanical and electronic shutters both turned on, but if I am remembering correctly, to go beyond ISO 6400 on the older X-Ts, you can use only the mechanical shutter.
On the newer models, that limit is raised to 12800, and may be higher on the X-T4 and X-S10.
Make sure the battery easily slides in and out of that compartment. If it is sticky, that battery might be starting to swell, which means you will quickly need a new battery.
Also make sure all of the info displays (you will need to check the manual -- the online version at Fujifilm is the same as the paper one) turn on and off.