The GUI for MCPE on the HTC ONE is very small, it has been like this since 0.6 and still there on 0.7
Linked issues
duplicates 1
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All issues related to the GUI HUD D-pad controller size being too small (despite the setting in the options that changes the D-pad controller size) have been linked to MCPE-3041.
If you'd like this bug fixed faster, please click vote on MCPE-3041 and provide any new information about this bug as comments on that bug report instead of here. Thanks!
Duplicate of MCPE-3041