How do I find an installed app that is not showing on my device?

A

AC Question

installed app is not showing on device

Recently my partner set up his sensor service app up and i found it brilliant.i enabled my sensor service app ready to set up but it isnt showing on device as downloaded only installed.I have tried numerous ways of getting it but i cant.even restored my apps n device and it isnt on any of the apps for doing downloads.
thankyou
lisa sanderson