How to hide /sdcard from being viewed when connecting phone to computer?

Question

Android

Good afternoon!
On my phone, / sdcard is used internally to store all sorts of official and sometimes personal information that I would not want to shine when connected to other people's windows computers
. There is also / sdcard2, which I often use as a portable flash drive
. There was a desire to format / sdcard into some some file system that windows does not see by default, and ideally encrypt it using android (cryptfs) and decrypt it along with / data when you turn on the phone. Tell me, please, where to read, in Linux systems I'm a kettle
Just in case, I give a more detailed description:
/ data 2 GB
/ sdcard 32 GB
/ sdcard2 32 GB
MTK6589T, Android 4.2 is almost bare