Please see the attached file for - Machine calibration for the extruder calibration:
This article is relevant to the FlashForge Adventurer4 & Adventurer 4 Pro
When you should do "Extruder Calibration"?
1. When you have changed the printers HotEnd
2. When you have loosened the HotEnd and tighten it back on
3. When the filament coming out the nozzle is not touching the bed
4. If your prints don't finish correctly
5. if Filament is only partially sticking to the bed
What you should do after Extruder Calibration?
1. Please level after calibration
2. Please restart the machine after levelling by holding down on the power button to the right of the screen.
3. After turning on please do a test print of a Benchy to validate that the machine has calibrated successfully.(You can get the Benchy.stl from https://www.3dbenchy.com/)