Overview of How to Uninstall Apps on Mac Completely
Dragging an app to the Trash removes the app but can leave support files behind.
Step 1: Quit the app
Make sure the app is not running, then drag it from Applications to the Trash.
Step 2: Use an uninstaller if provided
Some apps include their own uninstaller in the app folder or DMG. Use it first.
Step 3: Check the Library folder
In Finder, choose Go, then Go to Folder, and open ~/Library. Look in Application Support, Preferences and Caches for items named after the app.
Step 4: Empty the Trash
Empty the Trash to free the space.
Final thoughts
Follow these steps and always use official sources. If something does not work, restart the device and try again.