Assumed compliance
I tend to use Veracrypt to create an encrypted volume within a file - this can be named anything so usually I call it a movie file of some sort (kidsholiday or such so they don't accuse you of having pirated movies). All my confidential documents go into that. I don't think the everyday border agent has the skills to work that one out. The passwords are held in keypass so I honestly don't know them other than that they are very long and complex.
My main problem is that if they ask me for my social media accounts, I'm not sure they will believe me when I say I don't have any accounts (beyond linkedin)! (I'm a privacy guy).