Some have "uninstall" options. I used that with some since they didn't show in Revo.
CCleaner is known to remove some apps that do not have an uninstall option.
I accidentally unpinned and now can't find - Spotify!
Easiest is follow WR's kind guidance. Otherwise I think you'll find you have to use win10's search options more than in win7. The good news is that it tends to work.
I did find a very deeply locked hidden folder in Program Files that is supposed to be where the Microsoft Store apps are located
You don't want to play with that folder. Otherwise, what's been a huge help to me is adding Take Ownership to the right-click Context Menu. Copy/paste the following into a text file in Notepad, save it, then rename to [Some Name You Chose].reg . Double click that file to merge with the registry. I keep a copy of that reg file handy, since I need to run it after every win10 version upgrade.
------------
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\*\shell\runas]
@="Take Ownership"
"NoWorkingDirectory"=""
[HKEY_CLASSES_ROOT\*\shell\runas\command]
@="cmd.exe /c takeown /f \"%1\" && icacls \"%1\" /grant administrators:F"
"IsolatedCommand"="cmd.exe /c takeown /f \"%1\" && icacls \"%1\" /grant administrators:F"
[HKEY_CLASSES_ROOT\Directory\shell\runas]
@="Take Ownership"
"NoWorkingDirectory"=""
[HKEY_CLASSES_ROOT\Directory\shell\runas\command]
@="cmd.exe /c takeown /f \"%1\" /r /d y && icacls \"%1\" /grant administrators:F /t"
"IsolatedCommand"="cmd.exe /c takeown /f \"%1\" /r /d y && icacls \"%1\" /grant administrators:F /t"
---------------
Where are these shortcuts located? How do you handle an app that is pinned on the right but doesn't show on the left?
Bearing in mind that all or some of this may change with win10 2004 [Spring 2020], and noting that apparently Microsoft changed parts of the way this stuff works as win10 has evolved, so some stuff you’ll read will not apply if it was written for early versions of win10 …
Start Menu shortcuts are stored in C:\ProgramData\ Microsoft\ Windows\ Start Menu\ Programs for all users, & C:\Users\ [UserName]\ AppData\ Roaming\ Microsoft\ Windows\ Start Menu\ Programs for individual user accounts.
Some of your Taskbar icons/shortcuts are stored here: C:\Users \ [UserName]\ AppData\ Roaming\ Microsoft\ Internet Explorer\ Quick Launch\ User Pinned\ TaskBar
Both the Taskbar and Start Menu Tiles are designed to be set up by a biz [or OEM, e.g. Acer] using an xml file, that a biz for example would push out to connected win10 PCs/laptops along with any policy restrictions, such as limiting customization. And any app can be pinned to the Start Menu tile area &/or the Taskbar by right-clicking the .exe file and clicking either choice. To make this work win10 uses a database that you can’t access when you’re logged in – you need to create another account, & log into that, or use another copy of Windows that has access to the user folders for the account you’re interested in. It’s located here: C:\Users\ [UseName]\ AppData\ Local\ TileDataLayer
Windowscentral[.]com/how-backup-start-menu-layout-windows-10
Mspoweruser[.]com/clear-live-tile-cache-data-windows-10/
Pcmag[.]com/article/351216/how-to-tweak-your-tiles-in-windows-10
I routinely unhide permanently ProgramData and Username\appdata shortly after I get a machine.
In addition to what WR listed, you may need to also uncheck Hide protected operating... & may want to make sure Hide extensions... is also unchecked.