Not sure about CalyxOS but Graphene os has users so you could just switch to a different user and show them that and they probably wouldnt know to look for other users. Or you can disable apps, and then enable them again later. Disabling saves all data but hides the app and archives it. So it would only show up in the full app list in the settings not anywhere else. Not sure how thorough their checks are tho.

Personally tho if i was gonna go through a US border and was worried about my devices being checked id just back it all up to an encrypted external ssd, stick it in my checked bag, and wipe my devices. Then restore them once ur through.