Discord

Open Discord.  Click on the settings icon (gear) at the bottom of the window near the mic and username.

Click on Windows Settings  on the left side.

Click on the "Open Discord" toggle switch to turn it from the green checkmark to the grey x.

Restart your computer for the changes to take effect.

Go to the windows settings (gear icon) in the Start Menu.

Click on Apps.

Click on Startup.

Click on the Discord toggle switch to turn it from on to off.

Restart your computer for the changes to take effect.

Find the Discord App Icon in the lower right corner (the ^  icon near the clock).

Choose quit Discord.

Click on the magnifying glass  and search for "Apps & Features".

Click to open the "Apps & Features" for system settings.

Scroll down to find the Discord App.

Click on Discord.

Click Uninstall.

Restart your computer for the changes to take effect.