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Virtual rotation chart for common board orientations, please double check settings using PFD (Primary Flight Display) in Flight Data tab.
Level calibration
Place you your vehicle perfectly level and click Level button, do not move frame at all and wait complete processfor the process to complete.
Gyros Initialization
Those options allow gyro initialization while arming and safe initialization that wait the board is steady.
Filtering
If you experienced experience drifting issue while hovering, you can try to raise this value or find better balance for your propellers.