Hi VivienneKo,
I'm Amr, an independent advisor.
To change the charging settings on your ASUS VivoBook X321JP_S333JP laptop from 80% to 100%, you can try the following steps:
If you are using the MyAsus app
Open the MyAsus app on your laptop.
Go to the Hardware Settings section.
Look for the Battery Health Charging option and click on it.
You should see three modes: Full Capacity Mode, Balanced Mode, and Maximum Lifespan Mode.
Select Full Capacity Mode to charge your laptop to 100%.
If you don't have the app try to install it and check the above steps
Also, check this link out
https://www.asus.com/support/FAQ/1032726/
https://www.asus.com/support/FAQ/1044699/
I hope this is helpful. If you require any additional assistance, don't hesitate to respond to this.
Best Regard
Amr
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