See: https://images.techhive.com/images/article/2017/04/gboard-te...
From the main Messages window, swipe down and previously hidden search bar appears. There's no indication this is an option or it exists.
As far as I know it's been there since at least iOS 9.0 (probably longer) and 6 people hadn't found it yet.
The #1 thing that drives me crazy with phone UI is the huge amount of hidden functionality that you'll only ever discover if you find an article online or just randomly tap and swipe everything in the app until things happen. And then you have to remember that all in your head because there are no reminders anywhere about the functionality.
And what do they do with all of the space they save by not having indicators? Absolutely nothing at all. Tons of whitespace is added to the app so you are always scrolling around anyway.
They need to rebuild their software development team.
But I feel like I look stupid. And it does not always work.
There has to be a better way.
Just keep shaking until you see the popup appear. The phone also "thumps" (with the vibration motor) to let you know it felt what you were trying to do.
Disclaimer: I am not trying to posit that this is a better way.