Step 1. Go to the Among Us page in the Library

Step 2. Click the gear icon it will be to the right of "play"

Step 3. Below the icon a tab opens with a few options (this may be overwhelming for some users)
The tab will show the following phrases:
"Add to favorites"
"Add to"
"Remove from" (optional)
"Manage"
"Properties..."

Step 4. Click "Manage" and another tab will open:
"Add desktop shortcut"
"Browse local files"
"Hide this game"
"Uninstall"

Step 5. Click "Uninstall"

Congratulations you have uninstalled Among Us!