X-T100 is not designed for 100% Clean HDMI out.
There are 2 ways to achieve it: 1.Video Recoding Mode vs 2.Display Capture Mode
1. Press record and have a 30 minute time frame.
(This will give you Full 1080p video!)
2. Remove all settings like face detection and touch from the display
(This will a cropped Low Resolution out.)
Remove Display info by pressing [DISP BACK]
Remove Side buttons by disabling Touch:
Setting 2 (blue spanner)
Touch screen setting
TouchScreen Setting = OFF
Remove Face Detection [Green Box around face]