This extract from my FREE booklet may help you get to grips with the camera quickly even though it is aimed at the X-T20 user:
“Manual - with the lever in normal the Shutter Speed Dial and the Aperture Ring set their respective functions. (The shutter speed and aperture display in the viewfinder are in blue as both are under manual control).
Note: In Manual Mode the Exposure Compensation Dial is inactive however the Exposure Compensation Info in the viewfinder/screen can now be used to judge whether the exposure is correct as long as it has been activated as follows: Set Up > Screen Set-up > Disp. Custom Setting (on Page 2) > Expo. Comp. (Digit) or Expo. Comp. (Scale)
From: Rick Churchill. “Fujifilm X-T20 Tips”, 2018. Apple Books.