How/where can I turn on fast charge ?

[Petr]

Please tell us some basic information before asking for help:

1. Model Name: Zenfone 6 ZS630KL
2. Firmware Version:
3. Rooted or not:
4. Frequency of Occurrence:
5. APP Name & APP Version (If your issue relates to the app):
   

In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.

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[LP_ASUS]

Quick charge 3.0 is already enabled on your phone! ZenFone 6 supports QC 3.0 at 15 watts, but we can only qualify that with the bundled ASUS AC adapter. Performance with other electrical sources may vary.

[tahil_ashwin]

Try flipping the power adapter in the wall outlet by 180 degrees. Mine was charging slowly and after messing with all settings over an hour, I tried flipping the power adapter and lo! 'Fast charging' is back!