To add but on a different phone running Android 7.0 Nougat (where the
apps drawer disappeared, by default):
Settings -> Display -> Home screen -> Select Home
Choices are:
- Home: Proves all apps on the Home screen (very messy).
- EasyHome: Proves an easier interface for beginners with a simpler
layout and larger font size. (No thanks. Maybe gramma would like it.)
- Home & app drawer: Provides separate layout for the ome screen and
apps list. (I'm not messy, not a boob, so this one's for me.)
The last one adds a home screen button to separately view the apps list
(aka apps drawer). Google, in its too often infinitesimal wisdom,
decided to take away the apps drawer in a default setup and instead
smash it all into a mess with all icons on the home screen(s). I've
seen users that do that with the Windows desktop, too, and with their
Start menus so when you ask them for something particular they have to
roam their eyes all over and keep clicking searching for the item.
I've read where some users report having to use a different launcher
(e.g., Nova) that gives them a swipe-up feature to get at the apps
drawer. Presumably that means the stock launcher doesn't have an option
to restore the apps drawer function.
To the OP:
The app's icon appearing on the home screen after its installation
depends on a setting in the Google Play Store app. Some folks don't
like installations putzing with their home screen layouts. They want
the app to install without disturbing their home screen layouts, so the
new app's icon only shows up in the app drawer. Since I only install
one app at a time and then determine to remove its icon (because I'll
only access it from the apps drawer) or to move to another home screen
or put into a folder to group with similar apps, I have an app install
put the new app's icon on the home screen -- however, there can be more
than one home screen. When installing an app, and with the Play Store
configured to deposit the new app's icon on "a" home screen, the icon
appears on whatever is the currently selected home screen. There's the
home-home screen (the one you get when pressing the Home button) and
there's the other-home screens (the ones you swipe to, or use the
dot-icon to select). Google really fucked up when all screens got
renamed as home screens rather than home screen and secondary screens.
So swipe between the home screens if there is more than one. Perhaps
your wife was on a different home screen when she did the install than
the home-home screen.
If your wife was moving the app's icon around, you sure she didn't
accidentally delete it from a home screen rather than remove it? On my
new phone and when dragging around an app icon, there appear TWO choices
at the top of the home screen: Uninstall and Remove. On my old phone,
there's just Remove. Well, maybe your wife uninstalled the app when she
meant to only remove its icon from a home screen. Did you go into the
app manager to check the app is still installed?
Some other hints here:
https://www.technipages.com/android-icons-disappear-from-home-screen
A trick to show the home screens (reduced in size) along with all
available apps, widgets, and wallpapers is to long-press a blank space
on a home screen. This is to substitute for the lack of a home screen
icon to the apps drawer but also includes widgets and wallpaper
selections. With my Nougat phone, it's one layout showing the home
screens, selection section, and selection buttons. One some phones, a
menu pops up for picking a selection.